Cho \(% MathType!MTEF!2!1!+- % feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamOzamaabm % aabaGaamiEaaGaayjkaiaawMcaaiabg2da9maalaaabaGaaGymaaqa % aiaadIhaaaGaey4kaSYaaSaaaeaacaaIYaaabaGaamiEamaaCaaale % qabaGaaGOmaaaaaaGccqGHRaWkdaWcaaqaaiaaiodaaeaacaWG4bWa % aWbaaSqabeaacaaIZaaaaaaaaaa!4366! f\left( x \right) = \frac{1}{x} + \frac{2}{{{x^2}}} + \frac{3}{{{x^3}}}\). Tính f’(-1).
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Lời giải:
Báo sai\(% MathType!MTEF!2!1!+- % feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamOzaiaacE % cadaqadaqaaiaadIhaaiaawIcacaGLPaaacqGH9aqpdaqadaqaamaa % laaabaGaaGymaaqaaiaadIhaaaGaey4kaSYaaSaaaeaacaaIYaaaba % GaamiEamaaCaaaleqabaGaaGOmaaaaaaGccqGHRaWkdaWcaaqaaiaa % iodaaeaacaWG4bWaaWbaaSqabeaacaaIZaaaaaaaaOGaayjkaiaawM % caamaaCaaaleqabaGaai4laaaakiabg2da9iabgkHiTmaalaaabaGa % aGymaaqaaiaadIhadaahaaWcbeqaaiaaikdaaaaaaOGaeyOeI0YaaS % aaaeaacaaI0aaabaGaamiEamaaCaaaleqabaGaaG4maaaaaaGccqGH % sisldaWcaaqaaiaaiMdaaeaacaWG4bWaaWbaaSqabeaacaaI0aaaaa % aaaaa!5290! f'\left( x \right) = {\left( {\frac{1}{x} + \frac{2}{{{x^2}}} + \frac{3}{{{x^3}}}} \right)^/} = - \frac{1}{{{x^2}}} - \frac{4}{{{x^3}}} - \frac{9}{{{x^4}}}\) \(% MathType!MTEF!2!1!+- % feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaeyO0H4Taam % OzaiaacEcadaqadaqaaiaaigdaaiaawIcacaGLPaaacqGH9aqpcqGH % sislcaaIXaGaeyOeI0IaaGinaiabgkHiTiaaiMdacqGH9aqpcqGHsi % slcaaIXaGaaGinaaaa!459F! \Rightarrow f'\left( 1 \right) = - 1 - 4 - 9 = - 14\)