Cho \(% MathType!MTEF!2!1!+- % feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaaeaaaaaaaaa8 % qadaWdbaqaaiaadAgadaqadaqaaiaadIhaaiaawIcacaGLPaaacaqG % KbGaamiEaiabg2da9iaadAeadaqadaqaaiaadIhaaiaawIcacaGLPa % aacqGHRaWkcaWGdbaaleqabeqdcqGHRiI8aaaa!4364! \int {f\left( x \right){\rm{d}}x = F\left( x \right) + C}\). Khi đó với \(a\ne 0; a,b\) là hằng số ta có \(% MathType!MTEF!2!1!+- % feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaaeaaaaaaaaa8 % qadaWdbaqaaiaadAgadaqadaqaaiaadggacaWG4bGaey4kaSIaamOy % aaGaayjkaiaawMcaaiaabsgacaWG4baaleqabeqdcqGHRiI8aaaa!4012! \int {f\left( {ax + b} \right){\rm{d}}x} \) bằng.
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Lời giải:
Báo saiTheo công thức nguyên hàm mở rộng ta có: \(% MathType!MTEF!2!1!+- % feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaaeaaaaaaaaa8 % qadaWdbaqaaiaadAgadaqadaqaaiaadggacaWG4bGaey4kaSIaamOy % aaGaayjkaiaawMcaaiaabsgacaWG4baaleqabeqdcqGHRiI8aOGaey % ypa0ZaaSaaaeaacaaIXaaabaGaamyyaaaacaWGgbWaaeWaaeaacaWG % HbGaamiEaiabgUcaRiaadkgaaiaawIcacaGLPaaacqGHRaWkcaWGdb % aaaa!4A7D! \int {f\left( {ax + b} \right){\rm{d}}x} = \frac{1}{a}F\left( {ax + b} \right) + C\)