Cho \(% MathType!MTEF!2!1!+- % feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaa8qCaeaaca % WGMbGaaiikaiaadIhacaGGPaGaamizaiaadIhacqGH9aqpcqGHsisl % caaIXaaaleaacaaIWaaabaGaaGinaaqdcqGHRiI8aaaa!41A9! \int\limits_0^4 {f(x)dx = - 1} \). Tích phân \(% MathType!MTEF!2!1!+- % feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaa8qCaeaaca % WGMbGaaiikaiaaisdacaWG4bGaaiykaiaadsgacaWG4baaleaacaaI % WaaabaGaaGymaaqdcqGHRiI8aaaa!3FB6! \int\limits_0^1 {f(4x)dx} \) bằng
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Lời giải:
Báo sai
Đặt \(% MathType!MTEF!2!1!+- % feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamiDaiabg2 % da9iaaisdacaWG4bGaeyO0H4TaamizaiaadshacqGH9aqpcaaI0aGa % amizaiaadIhacqGHshI3caWGKbGaamiEaiabg2da9maalaaabaGaam % izaiaadshaaeaacaaI0aaaaaaa!498F! t = 4x \Rightarrow dt = 4dx \Rightarrow dx = \frac{{dt}}{4}\)
Đổi cận:
\(% MathType!MTEF!2!1!+-
% feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
% 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9
% vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x
% fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGceaqabeaacaWG4b
% Gaeyypa0JaaGimaiabgkDiElaadshacqGH9aqpcaaIWaaabaGaamiE
% aiabg2da9iaaigdacqGHshI3caWG0bGaeyypa0JaaGinaaaaaa!45A5!
\begin{array}{l}
x = 0 \Rightarrow t = 0\\
x = 1 \Rightarrow t = 4
\end{array}\)
Khi đó
\(% MathType!MTEF!2!1!+- % feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaa8qCaeaaca % WGMbGaaiikaiaaisdacaWG4bGaaiykaiaadsgacaWG4baaleaacaaI % WaaabaGaaGymaaqdcqGHRiI8aOGaeyypa0Zaa8qCaeaacaWGMbGaai % ikaiaadshacaGGPaWaaSaaaeaacaWGKbGaamiDaaqaaiaaisdaaaGa % eyypa0ZaaSaaaeaacaaIXaaabaGaaGinaaaaaSqaaiaaicdaaeaaca % aI0aaaniabgUIiYdGcdaWdXbqaaiaadAgacaGGOaGaamiDaiaacMca % caWGKbGaamiDaaWcbaGaaGimaaqaaiaaisdaa0Gaey4kIipakiabg2 % da9maalaaabaGaeyOeI0IaaGymaaqaaiaaisdaaaaaaa!59B3! \int\limits_0^1 {f(4x)dx} = \int\limits_0^4 {f(t)\frac{{dt}}{4} = \frac{1}{4}} \int\limits_0^4 {f(t)dt} = \frac{{ - 1}}{4}\)
Đề thi thử tốt nghiệp THPT QG môn Toán năm 2020
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