Tỉ số \(% MathType!MTEF!2!1!+- % feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaaSaaaeaacq % qHuoarcaWG5baabaGaeuiLdqKaamiEaaaaaaa!3ACA! \frac{{\Delta y}}{{\Delta x}}\) của hàm số \(% MathType!MTEF!2!1!+- % feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamOzamaabm % aabaGaamiEaaGaayjkaiaawMcaaiabg2da9iaaikdacaWG4bWaaeWa % aeaacaWG4bGaeyOeI0IaaGymaaGaayjkaiaawMcaaaaa!4051! f\left( x \right) = 2x\left( {x - 1} \right)\) theo x và \(\Delta x\) là
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Lời giải:
Báo sai\(% MathType!MTEF!2!1!+- % feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGceaqabeaadaWcaa % qaaiabfs5aejaadMhaaeaacqqHuoarcaWG4baaaiabg2da9maalaaa % baGaamOzamaabmaabaGaamiEaaGaayjkaiaawMcaaiabgkHiTiaadA % gadaqadaqaaiaadIhadaWgaaWcbaGaaGimaaqabaaakiaawIcacaGL % PaaaaeaacaWG4bGaeyOeI0IaamiEamaaBaaaleaacaaIWaaabeaaaa % GccqGH9aqpdaWcaaqaaiaaikdacaWG4bWaaeWaaeaacaWG4bGaeyOe % I0IaaGymaaGaayjkaiaawMcaaiabgkHiTiaaikdacaWG4bWaaSbaaS % qaaiaaicdaaeqaaOWaaeWaaeaacaWG4bWaaSbaaSqaaiaaicdaaeqa % aOGaeyOeI0IaaGymaaGaayjkaiaawMcaaaqaaiaadIhacqGHsislca % WG4bWaaSbaaSqaaiaaicdaaeqaaaaaaOqaaiabg2da9maalaaabaGa % aGOmamaabmaabaGaamiEaiabgkHiTiaadIhadaWgaaWcbaGaaGimaa % qabaaakiaawIcacaGLPaaadaqadaqaaiaadIhacqGHRaWkcaWG4bWa % aSbaaSqaaiaaicdaaeqaaaGccaGLOaGaayzkaaGaeyOeI0IaaGOmam % aabmaabaGaamiEaiabgkHiTiaadIhadaWgaaWcbaGaaGimaaqabaaa % kiaawIcacaGLPaaaaeaacaWG4bGaeyOeI0IaamiEamaaBaaaleaaca % aIWaaabeaaaaGccqGH9aqpcaaIYaGaamiEaiabgUcaRiaaikdacaWG % 4bWaaSbaaSqaaiaaicdaaeqaaOGaeyOeI0IaaGOmaiabg2da9iaais % dacaWG4bGaey4kaSIaaGOmaiabfs5aejaadIhacqGHsislcaaIYaaa % aaa!83CA! \begin{array}{l} \frac{{\Delta y}}{{\Delta x}} = \frac{{f\left( x \right) - f\left( {{x_0}} \right)}}{{x - {x_0}}} = \frac{{2x\left( {x - 1} \right) - 2{x_0}\left( {{x_0} - 1} \right)}}{{x - {x_0}}}\\ = \frac{{2\left( {x - {x_0}} \right)\left( {x + {x_0}} \right) - 2\left( {x - {x_0}} \right)}}{{x - {x_0}}} = 2x + 2{x_0} - 2 = 4x + 2\Delta x - 2 \end{array}\)