Trắc nghiệm Giới hạn của dãy số Toán Lớp 11

Câu 1:

$\lim \left( {n - \sqrt[3]{{8{n^3} + 3n + 2}}} \right)$ bằng:

A. $+\infty$

B. $- \infty$

C. - 1

D. 0
Câu 2:

Tính giới hạn $I = \lim \left( {\sqrt {{n^2} - 2n + 3} - n} \right)$

A. - 1

B. 1

C. 0

D. $+ \infty$
Câu 3:

$\lim \frac{{\sin \left( {n!} \right)}}{{{n^2} + 1}}$ bằng

A. 0

B. 1

C. $+ \infty$

D. 2
Câu 4:

Giới hạn của dãy số (u_n) với ${u_n} = \frac{{3{n^3} + 2n - 1}}{{2{n^2} - n}}$ , bằng

A. $\frac{3}{2}$

B. 0

C. $+ \infty$

D. 1
Câu 5:

Giới hạn của dãy số (u_n) với ${u_n} = \frac{{{n^3} + 2n + 1}}{{{n^4} + 3{n^3} + 5{n^2} + 6}}$ bằng

A. 1

B. 0

C. $+ \infty$

D. $\frac{1}{3}$
Câu 6:

Tính $\lim \;{u_n}$ với ${u_n} = \frac{{2{n^3} - 3{n^2} + n + 5}}{{{n^3} - {n^2} + 7}}$ ?

A. - 3

B. 1

C. 2

D. 0
Câu 7:

Tính $\lim \;{u_n}$ , với ${u_n} = \frac{{5{n^2} + 3n - 7}}{{{n^2}}}$ ?

A. 5

B. 0

C. 3

D. - 7
Câu 8:

Tính $\lim \left( {5n - {n^2} + 1} \right)$

A. $+\infty$

B. $- \infty$

C. 5

D. - 1
Câu 9:

Tính $\lim\left( {{n^3} - 2n + 1} \right)$

A. 0

B. 1

C. $- \infty$

D. $+ \infty$
Câu 10:

Tổng của cấp số nhân vô hạn : $\frac{1}{2},\; - \frac{1}{4},\;....,\;\frac{{{{\left( { - 1} \right)}^{n + 1}}}}{{{2^n}}},....$ là

A. 1

B. $\frac{1}{3}$

C. $-\frac{1}{3}$

D. $-\frac{2}{3}$
Câu 11:

$\lim \frac{{\sqrt {2n + 3} }}{{\sqrt {2n} + 5}}$ bằng:

A. $\frac{5}{2}$

B. 1

C. $\frac{5}{7}$

D. $+ \infty$
Câu 12:

$\lim n\left( {\sqrt {{n^2} + 1} - \sqrt {{n^2} - 3} } \right)$ bằng?

A. $+ \infty$

B. 4

C. 2

D. - 1
Câu 13:

$\lim \frac{{\sqrt {4{n^2} + 5} - \sqrt {n + 4} }}{{2n - 1}}$ bằng?

A. 0

B. 1

C. 2

D. $+ \infty$
Câu 14:

Dãy số nào sau đây có giưới hạn là $+ \infty$ ?

A. $\;{u_n} = 9{n^2} - 2{n^5}$

B. ${u_n} = {n^4} - 4{n^5}$

C. ${u_n} = 4{n^2} - 3n$

D. ${u_n} = {n^3} - 5{n^4}$
Câu 15:

$\lim \left( {2{n^4} + 5{n^2} - 7n} \right)$ bằng

A. $+ \infty$

B. 0

C. 2

D. $-\infty$
Câu 16:

$\lim \left( { - 3{n^3} + 2{n^2} - 5} \right)$ bằng:

A. - 3

B. 0

C. $- \infty$

D. $+ \infty$
Câu 17:

$\lim \frac{{n + \sin 2n}}{{n + 5}}$ bằng:

A. $\frac{2}{5}$

B. $\frac{1}{5}$

C. 0

D. 1
Câu 18:

$\lim \frac{{1 + 2 + 3 + ... + n}}{{2{n^2}}}$ bằng

A. 0

B. $\frac{1}{4}$

C. $\frac{1}{2}$

D. $+ \infty$
Câu 19:

$\lim \frac{{\sqrt {n + 4} }}{{\sqrt n + 1}}$ có giá trị bằng?

A. 1

B. 2

C. 4

D. $+ \infty$
Câu 20:

$\lim \frac{{{2^n} + {3^n}}}{{{3^n}}}$ có giá trị bằng

A. 0

B. 1

C. $\frac{2}{3}$

D. $\frac{5}{3}$
Câu 21:

Dãy số nào sau đây có giới hạn bằng $\frac{1}{5}$ ?

A. $\frac{{{n^2} - 2n}}{{5n + 5{n^2}}}$

B. $\frac{{1 - 2n}}{{5n + 5}}$

C. $\frac{{1 - 2{n^2}}}{{5n + 5}}$

D. $\frac{{1 - 2n}}{{5n + 5{n^2}}}$
Câu 22:

$\lim \frac{{3{n^4} - 2n + 4}}{{4{n^2} + 2n + 3}}$ bằng?

A. 0

B. $+ \infty$

C. $\frac{3}{4}$

D. $\frac{2}{7}$
Câu 23:

$\lim \frac{{3{n^2} - 2n + 1}}{{4{n^4} + 2n + 1}}$ bằng?

A. 0

B. $+ \infty$

C. $\frac{3}{4}$

D. $\frac{2}{7}$
Câu 24:

$\lim \frac{{3 - 4n}}{{5n}}$ có giá trị bằng:

A. $\frac{3}{5}$

B. $-\frac{3}{5}$

C. $\frac{4}{5}$

D. $-\frac{4}{5}$
Câu 25:

Dãy số nào sau đây có giới hạn bằng 0?

A. ${\left( {\frac{4}{3}} \right)^n}$

B. ${\left( {\frac{{-4}}{3}} \right)^n}$

C. ${\left( {\frac{{ - 5}}{3}} \right)^n}$

D. ${\left( {\frac{1}{3}} \right)^n}$
Câu 26:

Dãy số nào sau đây có giới hạn khác 0?

A. $\frac{1}{n}$

B. $\frac{1}{{\sqrt n }}$

C. $\frac{{n + 1}}{n}$

D. $\frac{{\sin n}}{{\sqrt n }}$
Câu 27:

Tính giới hạn của dãy số $% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyDamaaBa % aaleaacaWGUbaabeaakiabg2da9maalaaabaGaaiikaiaad6gacqGH % RaWkcaaIXaGaaiykamaakaaabaGaaGymamaaCaaaleqabaGaaG4maa % aakiabgUcaRiaaikdadaahaaWcbeqaaiaaiodaaaGccqGHRaWkcaGG % UaGaaiOlaiaac6cacqGHRaWkcaWGUbWaaWbaaSqabeaacaaIZaaaaa % qabaaakeaacaaIZaGaamOBamaaCaaaleqabaGaaG4maaaakiabgUca % Riaad6gacqGHRaWkcaaIYaaaaaaa!4D3F! {u_n} = \frac{{(n + 1)\sqrt {{1^3} + {2^3} + ... + {n^3}} }}{{3{n^3} + n + 2}}$

A. $% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaey4kaSIaey % OhIukaaa!3847! + \infty$

B. $% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaey4kaSIaey % OhIukaaa!38 - \infty$

C. $\frac{1}{9}$

D. 1
Câu 28:

Tính giới hạn của dãy số $% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyDamaaBa % aaleaacaWGUbaabeaakiabg2da9maalaaabaGaaGymaaqaaiaaikda % daGcaaqaaiaaigdaaSqabaGccqGHRaWkdaGcaaqaaiaaikdaaSqaba % aaaOGaey4kaSYaaSaaaeaacaaIXaaabaGaaG4mamaakaaabaGaaGOm % aaWcbeaakiabgUcaRiaaikdadaGcaaqaaiaaiodaaSqabaaaaOGaey % 4kaSIaaiOlaiaac6cacaGGUaGaey4kaSYaaSaaaeaacaaIXaaabaGa % aiikaiaad6gacqGHRaWkcaaIXaGaaiykamaakaaabaGaamOBaaWcbe % aakiabgUcaRiaad6gadaGcaaqaaiaad6gacqGHRaWkcaaIXaaaleqa % aaaaaaa!5138! {u_n} = \frac{1}{{2\sqrt 1 + \sqrt 2 }} + \frac{1}{{3\sqrt 2 + 2\sqrt 3 }} + ... + \frac{1}{{(n + 1)\sqrt n + n\sqrt {n + 1} }}$

A. $% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaey4kaSIaey % OhIukaaa!3847! + \infty$

B. $% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaey4kaSIaey % OhIukaaa!3847! - \infty$

C. 0

D. 1
Câu 29:

Tính giới hạn của dãy số $% MathType!MTEF!2!1!+- % feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyDamaaBa % aaleaacaWGUbaabeaakiabg2da9iaadghacqGHRaWkcaaIYaGaamyC % amaaCaaaleqabaGaaGOmaaaakiabgUcaRiaac6cacaGGUaGaaiOlai % abgUcaRiaad6gacaWGXbWaaWbaaSqabeaacaWGUbaaaaaa!447C! {u_n} = q + 2{q^2} + ... + n{q^n}$ với |q| < 1

A. $% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaey4kaSIaey % OhIukaaa!3847! + \infty$

B. $% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaey4kaSIaey % OhIukaaa!3847! - \infty$

C. $% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaaSaaaeaaca % WGXbaabaWaaeWaaeaacaaIXaGaeyOeI0IaamyCaaGaayjkaiaawMca % amaaCaaaleqabaGaaGOmaaaaaaaaaa!3C0A! \frac{q}{{{{\left( {1 - q} \right)}^2}}}$

D. $% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaaSaaaeaaca % WGXbaabaWaaeWaaeaacaaIXaGaey4kaSIaamyCaaGaayjkaiaawMca % amaaCaaaleqabaGaaGOmaaaaaaaaaa!3BFF! \frac{q}{{{{\left( {1 + q} \right)}^2}}}$
Câu 30:

Tính giới hạn của dãy số $% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyDamaaBa % aaleaacaWGUbaabeaakiabg2da9maaqahabaWaaSaaaeaacaWGUbaa % baGaamOBamaaCaaaleqabaGaaGOmaaaakiabgUcaRiaadUgaaaaale % aacaWGRbGaeyypa0JaaGymaaqaaiaad6gaa0GaeyyeIuoaaaa!43BE! {u_n} = \sum\limits_{k = 1}^n {\frac{n}{{{n^2} + k}}}$

A. $% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaey4kaSIaey % OhIukaaa!3847! + \infty$

B. $% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaey4kaSIaey % OhIukaaa!3847!- - \infty$

C. 3

D. 1
Câu 31:

Tính giới hạn của dãy số $% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyDamaaBa % aaleaacaWGUbaabeaakiabg2da9maaqahabaWaaSaaaeaacaaIYaGa % am4AaiabgkHiTiaaigdaaeaacaaIYaWaaWbaaSqabeaacaWGRbaaaa % aaaeaacaWGRbGaeyypa0JaaGymaaqaaiaad6gaa0GaeyyeIuoaaaa!4435! {u_n} = \sum\limits_{k = 1}^n {\frac{{2k - 1}}{{{2^k}}}}$

A. $% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaey4kaSIaey % OhIukaaa!3847! + \infty$

B. $% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaey4kaSIaey % OhIukaaa!3847! -\infty$

C. 3

D. 1
Câu 32:

Tính giới hạn của dãy số $% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyDamaaBa % aaleaacaWGUbaabeaakiabg2da9maalaaabaGaaGOmamaaCaaaleqa % baGaaG4maaaakiabgkHiTiaaigdaaeaacaaIYaWaaWbaaSqabeaaca % aIZaaaaOGaey4kaSIaaGymaaaacaGGUaWaaSaaaeaacaaIZaWaaWba % aSqabeaacaaIZaaaaOGaeyOeI0IaaGymaaqaaiaaiodadaahaaWcbe % qaaiaaiodaaaGccqGHRaWkcaaIXaaaaiaac6cacaGGUaGaaiOlaiaa % c6cadaWcaaqaaiaad6gadaahaaWcbeqaaiaaiodaaaGccqGHsislca % aIXaaabaGaamOBamaaCaaaleqabaGaaG4maaaakiabgUcaRiaaigda % aaaaaa!5126! {u_n} = \frac{{{2^3} - 1}}{{{2^3} + 1}}.\frac{{{3^3} - 1}}{{{3^3} + 1}}....\frac{{{n^3} - 1}}{{{n^3} + 1}}$

A. $% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaey4kaSIaey % OhIukaaa!3847! + \infty$

B. $% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaey4kaSIaey % OhIukaaa!3 - \infty$

C. 1

D. $\frac{2}{3}$
Câu 33:

Tính giới hạn của dãy số $% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyDamaaBa % aaleaacaWGUbaabeaakiabg2da9iaacIcacaaIXaGaeyOeI0YaaSaa % aeaacaaIXaaabaGaamivamaaBaaaleaacaaIXaaabeaaaaGccaGGPa % GaaiikaiaaigdacqGHsisldaWcaaqaaiaaigdaaeaacaWGubWaaSba % aSqaaiaaikdaaeqaaaaakiaacMcacaGGUaGaaiOlaiaac6cacaGGOa % GaaGymaiabgkHiTmaalaaabaGaaGymaaqaaiaadsfadaWgaaWcbaGa % amOBaaqabaaaaOGaaiykaaaa!4C2E! {u_n} = (1 - \frac{1}{{{T_1}}})(1 - \frac{1}{{{T_2}}})...(1 - \frac{1}{{{T_n}}})$ trong đó $% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamivamaaBa % aaleaacaWGUbaabeaakiabg2da9maalaaabaGaamOBaiaacIcacaWG % UbGaey4kaSIaaGymaiaacMcaaeaacaaIYaaaaaaa!3EA4! {T_n} = \frac{{n(n + 1)}}{2}$ .

A. $% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaey4kaSIaey % OhIukaaa!3847! + \infty$

B. $% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaeyOeI0Iaey % OhIukaaa!3852! - \infty$

C. $\frac{1}{3}$

D. 1
Câu 34:

Tính giới hạn $% MathType!MTEF!2!1!+- % feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaciiBaiaacM % gacaGGTbWaamWaaeaadaqadaqaaiaaigdacqGHsisldaWcaaqaaiaa % igdaaeaacaaIYaWaaWbaaSqabeaacaaIYaaaaaaaaOGaayjkaiaawM % caamaabmaabaGaaGymaiabgkHiTmaalaaabaGaaGymaaqaaiaaioda % daahaaWcbeqaaiaaikdaaaaaaaGccaGLOaGaayzkaaGaaiOlaiaac6 % cacaGGUaWaaeWaaeaacaaIXaGaeyOeI0YaaSaaaeaacaaIXaaabaGa % amOBamaaCaaaleqabaGaaGOmaaaaaaaakiaawIcacaGLPaaaaiaawU % facaGLDbaaaaa!4E04! \lim \left[ {\left( {1 - \frac{1}{{{2^2}}}} \right)\left( {1 - \frac{1}{{{3^2}}}} \right)...\left( {1 - \frac{1}{{{n^2}}}} \right)} \right]$

A. 1

B. $\frac{1}{2}$

C. $\frac{3}{4}$

D. $\frac{1}{4}$
Câu 35:

Tính giới hạn $% MathType!MTEF!2!1!+- % feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaciiBaiaacM % gacaGGTbWaamWaaeaadaWcaaqaaiaaigdaaeaacaaIXaGaaiOlaiaa % isdaaaGaey4kaSYaaSaaaeaacaaIXaaabaGaaGOmaiaac6cacaaI1a % aaaiabgUcaRiaac6cacaGGUaGaaiOlaiabgUcaRmaalaaabaGaaGym % aaqaaiaad6gacaGGOaGaamOBaiabgUcaRiaaiodacaGGPaaaaaGaay % 5waiaaw2faaaaa!4B08! \lim \left[ {\frac{1}{{1.4}} + \frac{1}{{2.5}} + ... + \frac{1}{{n(n + 3)}}} \right]$

A. $% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaaSaaaeaaca % aIXaGaaGymaaqaaiaaigdacaaI4aaaaaaa!38F7! \frac{{11}}{{18}}$

B. 2

C. 1

D. 3
Câu 36:

Tính giới hạn $% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaciiBaiaacM % gacaGGTbWaamWaaeaadaWcaaqaaiaaigdaaeaacaaIXaGaaiOlaiaa % iodaaaGaey4kaSYaaSaaaeaacaaIXaaabaGaaGOmaiaac6cacaaI0a % aaaiabgUcaRiaac6cacaGGUaGaaiOlaiaac6cacqGHRaWkdaWcaaqa % aiaaigdaaeaacaWGUbWaaeWaaeaacaWGUbGaey4kaSIaaGOmaaGaay % jkaiaawMcaaaaaaiaawUfacaGLDbaaaaa!4BE8! \lim \left[ {\frac{1}{{1.3}} + \frac{1}{{2.4}} + .... + \frac{1}{{n\left( {n + 2} \right)}}} \right]$

A. $% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaaSaaaeaaca % aIZaaabaGaaGinaaaaaaa!377F! \frac{3}{4}$

B. $\frac{2}{3}$

C. 1

D. 0
Câu 37:

Tìm $% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaciiBaiaacM % gacaGGTbWaamWaaeaadaWcaaqaaiaaigdaaeaacaaIXaGaaiOlaiaa % iodaaaGaey4kaSYaaSaaaeaacaaIXaaabaGaaG4maiaac6cacaaI1a % aaaiabgUcaRiaac6cacaGGUaGaaiOlaiaac6cacqGHRaWkdaWcaaqa % aiaaigdaaeaacaWGUbWaaeWaaeaacaaIYaGaamOBaiabgUcaRiaaig % daaiaawIcacaGLPaaaaaaacaGLBbGaayzxaaaaaa!4CA5! \lim \left[ {\frac{1}{{1.3}} + \frac{1}{{3.5}} + .... + \frac{1}{{n\left( {2n + 1} \right)}}} \right]$

A. 1

B. $\frac{1}{2}$

C. $% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaaSaaaeaaca % aIYaaabaGaaG4maaaaaaa!377D! \frac{2}{3}$

D. 2
Câu 38:

Tính giới hạn $% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaciiBaiaacM % gacaGGTbWaamWaaeaadaWcaaqaaiaaigdaaeaacaaIXaGaaiOlaiaa % ikdaaaGaey4kaSYaaSaaaeaacaaIXaaabaGaaGOmaiaac6cacaaIZa % aaaiabgUcaRiaac6cacaGGUaGaaiOlaiaac6cacqGHRaWkdaWcaaqa % aiaaigdaaeaacaWGUbWaaeWaaeaacaWGUbGaey4kaSIaaGymaaGaay % jkaiaawMcaaaaaaiaawUfacaGLDbaaaaa!4BE5! \lim \left[ {\frac{1}{{1.2}} + \frac{1}{{2.3}} + .... + \frac{1}{{n\left( {n + 1} \right)}}} \right]$

A. $% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaaSaaaeaaca % aIZaaabaGaaGOmaaaaaaa!377D! \frac{3}{2}$

B. 0

C. 1

D. Không có giới hạn
Câu 39:

Tìm giá trị đúng của $% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaam4uaiabg2 % da9maakaaabaGaaGOmaaWcbeaakmaabmaabaGaaGymaiabgUcaRmaa % laaabaGaaGymaaqaaiaaikdaaaGaey4kaSYaaSaaaeaacaaIXaaaba % GaaGinaaaacqGHRaWkdaWcaaqaaiaaigdaaeaacaaI4aaaaiabgUca % Riaac6cacaGGUaGaaiOlaiabgUcaRmaalaaabaGaaGymaaqaaiaaik % dadaahaaWcbeqaaiaad6gaaaaaaOGaey4kaSIaaiOlaiaac6cacaGG % UaGaaiOlaiaac6cacaGGUaGaaiOlaaGaayjkaiaawMcaaaaa!4E85! S = \sqrt 2 \left( {1 + \frac{1}{2} + \frac{1}{4} + \frac{1}{8} + ... + \frac{1}{{{2^n}}} + .......} \right)$

A. $% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaaOaaaeaaca % aIYaaaleqaaOGaey4kaSIaaGymaaaa!3872! \sqrt 2 + 1$

B. 2

C. $% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaaOaaaeaaca % aIYaaaleqaaOGaey4kaSIaaGymaaaa!3872! 2\sqrt 2$

D. 1
Câu 40:

Tìm lim $u_n$ biết $% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyDamaaBa % aaleaacaWGUbaabeaakiabg2da9maayaaabaWaaOaaaeaacaaIYaWa % aOaaaeaacaaIYaGaaiOlaiaac6cacaGGUaWaaOaaaeaacaaIYaaale % qaaaqabaaabeaaaeaacaWGUbGaaeiiaiaabsgacaqGHbGaaeyDaiaa % bccacaqGJbGaaeyyaiaab6gaaOGaayjo+daaaa!474E! {u_n} = \underbrace {\sqrt {2\sqrt {2...\sqrt 2 } } }_{n{\rm{ dau can}}}$

A. $% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaey4kaSIaey % OhIukaaa!3847! + \infty$

B. $% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaey4kaSIaey % OhIukaaa!3847! -\infty$

C. 1

D. 2
Câu 41:

Tìm lim $u_n$ biết $% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyDamaaBa % aaleaacaWGUbaabeaakiabg2da9maaqahabaWaaSaaaeaacaaIXaaa % baWaaOaaaeaacaWGUbWaaWbaaSqabeaacaaIYaaaaOGaey4kaSIaam % 4AaaWcbeaaaaaabaGaam4Aaiabg2da9iaaigdaaeaacaWGUbaaniab % ggHiLdaaaa!4396! {u_n} = \sum\limits_{k = 1}^n {\frac{1}{{\sqrt {{n^2} + k} }}}$

A. $% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaey4kaSIaey % OhIukaaa!3847! + \infty$

B. $% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaey4kaSIaey % OhIukaaa!3847! - \infty$

C. 1

D. 3

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Trắc nghiệm Giới hạn của dãy số Toán Lớp 11

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TÀI LIỆU THAM KHẢO