F(x) là nguyên hàm của f(x) trên R thỏa \(% MathType!MTEF!2!1!+- % feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaa8qCaKaaGg % aakmaalaaajaaObaGaaGymaaqaaiaadIhaaaGaamOraOWaaeWaaeaa % caWG4baacaGLOaGaayzkaaqcaaQaaeizaiaadIhaaKazbaiabaGaaG % ymaaqcbaEaaiaabwgaaKWaGkabgUIiYdGccqGH9aqpcaaIXaaaaa!4742! \int\limits_1^{\rm{e}} {\frac{1}{x}F\left( x \right){\rm{d}}x} = 1\) và F(e) = 3. Khi đó \(% MathType!MTEF!2!1!+- % feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaa8qCaKaaGg % aaciGGSbGaaiOBaiaadIhacaWGMbGcdaqadaqaaiaadIhaaiaawIca % caGLPaaajaaOcaqGKbGaamiEaaqcbaEaaiaaigdaaeaacaqGLbaajm % aOcqGHRiI8aaaa!450F! \int\limits_1^{\rm{e}} {\ln xf\left( x \right){\rm{d}}x} \)

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