Tìm tập nghiệm S của bất phương trình \(% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaciiBaiaac+ % gacaGGNbWaaSbaaSqaamaalaaabaGaaGymaaqaaiaaikdaaaaabeaa % kmaalaaabaGaaGOmaaqaaiaadIhacqGHsislcaaIXaaaaiabg6da+i % aaikdaaaa!3FB6! {\log _{\frac{1}{2}}}\frac{2}{{x - 1}} > 2\)
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Lời giải:
Báo sai\(% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaciiBaiaac+ % gacaGGNbWaaSbaaSqaamaalaaabaGaaGymaaqaaiaaikdaaaaabeaa % kmaalaaabaGaaGOmaaqaaiaadIhacqGHsislcaaIXaaaaiabg6da+i % aaikdacqGHuhY2daGabaabaeqabaWaaSaaaeaacaaIYaaabaGaamiE % aiabgkHiTiaaigdaaaGaeyOpa4JaaGimaaqaamaalaaabaGaaGOmaa % qaaiaadIhacqGHsislcaaIXaaaaiabgYda8maalaaabaGaaGymaaqa % aiaaisdaaaaaaiaawUhaaaaa!4E64! {\log _{\frac{1}{2}}}\frac{2}{{x - 1}} > 2 \Leftrightarrow \left\{ \begin{array}{l} \frac{2}{{x - 1}} > 0\\ \frac{2}{{x - 1}} < \frac{1}{4} \end{array} \right.\)
\(% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaeyi1HS9aai % qaaqaabeqaaiaadIhacqGHsislcaaIXaGaeyOpa4JaaGimaaqaaiaa % iIdacqGH8aapcaWG4bGaeyOeI0IaaGymaaaacaGL7baacqGHuhY2ca % WG4bGaeyOpa4JaaGyoaaaa!4767! \Leftrightarrow \left\{ \begin{array}{l} x - 1 > 0\\ 8 < x - 1 \end{array} \right. \Leftrightarrow x > 9\)