Tìm tập nghiệm của bất phương trình \(% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaciiBaiaac+ % gacaGGNbWaaSbaaSqaaiaaicdacaGGSaGaaGynaaqabaGcdaqadeqa % aiaaikdacaWG4bGaeyOeI0IaaGymaaGaayjkaiaawMcaaiabg6da+i % abgkHiTiaaikdaaaa!42BF! {\log _{0,5}}\left( {2x - 1} \right) > - 2\)
Hãy suy nghĩ và trả lời câu hỏi trước khi xem đáp án
Lời giải:
Báo saiBPT \(% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaaiqabqaabe % qaaiaaikdacaWG4bGaeyOeI0IaaGymaiabg6da+iaaicdaaeaacaaI % YaGaamiEaiabgkHiTiaaigdacqGH8aapdaqadeqaaiaaicdacaGGSa % GaaGynaaGaayjkaiaawMcaamaaCaaaleqabaGaeyOeI0IaaGOmaaaa % aaGccaGL7baaaaa!4631! \iff\left\{ \begin{array}{l} 2x - 1 > 0\\ 2x - 1 < {\left( {0,5} \right)^{ - 2}} \end{array} \right.\)\(% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaaiqabqaabe % qaaiaadIhacqGH+aGpdaWcaaqaaiaaigdaaeaacaaIYaaaaaqaaiaa % dIhacqGH8aapdaWcaaqaaiaaiwdaaeaacaaIYaaaaaaacaGL7baaaa % a!3E2E! \iff\left\{ \begin{array}{l} x > \frac{1}{2}\\ x < \frac{5}{2} \end{array} \right.\)\(% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaaSaaaeaaca % aIXaaabaGaaGOmaaaacqGH8aapcaWG4bGaeyipaWZaaSaaaeaacaaI % 1aaabaGaaGOmaaaaaaa!3C0B! \iff\frac{1}{2} < x < \frac{5}{2}\)