Cho hàm số \(% MathType!MTEF!2!1!+- % feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamOzamaabm % aabaGaamiEaaGaayjkaiaawMcaaiabg2da9maalaaabaGaaGOmaiaa % dIhaaeaacaWG4bGaeyOeI0IaaGymaaaaaaa!3ED8! f\left( x \right) = \frac{{2x}}{{x - 1}}\). Giá trị f'(1) là
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Lời giải:
Báo sai\(% MathType!MTEF!2!1!+- % feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGabmOzayaafa % WaaeWaaeaacaWG4baacaGLOaGaayzkaaGaeyypa0ZaaeWaaeaadaWc % aaqaaiaaikdacaWG4baabaGaamiEaiabgkHiTiaaigdaaaaacaGLOa % GaayzkaaWaaWbaaSqabeaakiadacUHYaIOaaGaeyypa0ZaaSaaaeaa % caaIYaWaaeWaaeaacaWG4bGaeyOeI0IaaGymaaGaayjkaiaawMcaai % abgkHiTiaaikdacaWG4baabaWaaeWaaeaacaWG4bGaeyOeI0IaaGym % aaGaayjkaiaawMcaamaaCaaaleqabaGaaGOmaaaaaaGccqGH9aqpda % WcaaqaaiabgkHiTiaaikdaaeaadaqadaqaaiaadIhacqGHsislcaaI % XaaacaGLOaGaayzkaaWaaWbaaSqabeaacaaIYaaaaaaaaaa!5929! f'\left( x \right) = {\left( {\frac{{2x}}{{x - 1}}} \right)^\prime } = \frac{{2\left( {x - 1} \right) - 2x}}{{{{\left( {x - 1} \right)}^2}}} = \frac{{ - 2}}{{{{\left( {x - 1} \right)}^2}}}\)
Suy ra không tồn tại f'(1)