Nếu 3 ∫ 2 f ( x ) d x = − 1 thì 2 ∫ 1 f ( x ) d x = 1 .
Giải thích
b) Sai.Nếu \(\int\limits_2^3 {f\left( x \right)} \,{\rm{d}}x = - 1\) thì \(\int\limits_1^2 {f\left( x \right)} \,{\rm{d}}x = \int\limits_1^3 {f\left( x \right)} \,{\rm{d}}x - \int\limits_2^3 {f\left( x \right)} \,{\rm{d}}x = 2 - \left( { - 1} \right) = 3\).