Bất phương trình \(% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaciiBaiaac+ % gacaGGNbWaaSbaaSqaamaalaaabaGaaG4maaqaaiaaisdaaaaabeaa % kiaacIcacaaIYaGaamiEaiabgUcaRiaaigdacaGGPaGaeyyzImRaci % iBaiaac+gacaGGNbWaaSbaaSqaamaalaaabaGaaG4maaqaaiaaisda % aaaabeaakiaacIcacaWG4bGaey4kaSIaaGOmaiaacMcaaaa!497F! {\log _{\frac{3}{4}}}(2x + 1) \ge {\log _{\frac{3}{4}}}(x + 2)\) có tập nghiệm là
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Lời giải:
Báo saiBất phương trình đã cho \(% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaeyi1HSTaaG % imaiabgYda8iaaikdacaWG4bGaey4kaSIaaGymaiabgsMiJkaadIha % cqGHRaWkcaaIYaGaeyi1HSTaeyOeI0YaaSaaaeaacaaIXaaabaGaaG % OmaaaacqGH8aapcaWG4bGaeyizImQaaGymaaaa!4AF5! \Leftrightarrow 0 < 2x + 1 \le x + 2 \Leftrightarrow - \frac{1}{2} < x \le 1\)
Tập nghiệm là : \(% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaam4uaiabg2 % da9maajadabaGaeyOeI0YaaSaaaeaacaaIXaaabaGaaGOmaaaacaGG % 7aGaaGymaaGaayjkaiaaw2faaaaa!3DB2! S= \left( { - \frac{1}{2};1} \right]\)