Bất phương trình \(% MathType!MTEF!2!1!+- % feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaciiBaiaac+ % gacaGGNbWaaSbaaSqaamaalaaabaGaaGOmaaqaaiaaiodaaaaabeaa % kmaabmaabaGaaGOmaiaadIhadaahaaWcbeqaaiaaikdaaaGccqGHsi % slcaWG4bGaey4kaSIaaGymaaGaayjkaiaawMcaaiabgYda8iaaicda % aaa!43FC! {\log _{\frac{2}{3}}}\left( {2{x^2} - x + 1} \right) < 0\) có tập nghiệm là:
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Lời giải:
Báo sai\(% MathType!MTEF!2!1!+- % feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaciiBaiaac+ % gacaGGNbWaaSbaaSqaamaalaaabaGaaGOmaaqaaiaaiodaaaaabeaa % kmaabmaabaGaaGOmaiaadIhadaahaaWcbeqaaiaaikdaaaGccqGHsi % slcaWG4bGaey4kaSIaaGymaaGaayjkaiaawMcaaiabgYda8iaaicda % cqGHuhY2caaIYaGaamiEamaaCaaaleqabaGaaGOmaaaakiabgkHiTi % aadIhacqGHRaWkcaaIXaGaeyOpa4JaaGymaiabgsDiBpaadeaaeaqa % beaacaWG4bGaeyipaWJaaGimaaqaaiaadIhacqGH+aGpdaWcaaqaai % aaigdaaeaacaaIYaaaaaaacaGLBbaaaaa!57F3! {\log _{\frac{2}{3}}}\left( {2{x^2} - x + 1} \right) < 0 \Leftrightarrow 2{x^2} - x + 1 > 1 \Leftrightarrow \left[ \begin{array}{l} x < 0\\ x > \frac{1}{2} \end{array} \right.\)