Nếu \(\int\limits_{1}^{2}{f\left( x \right)dx}=2,\text{ }\int\limits_{2}^{6}{f\left( x \right)dx}=3\) thì \(\int\limits_{1}^{6}{f\left( x \right)dx}\) bằng
Nếu \(\int\limits_{1}^{2}{f\left( x \right)dx}=2,\text{ }\int\limits_{2}^{6}{f\left( x \right)dx}=3\) thì \(\int\limits_{1}^{6}{f\left( x \right)dx}\) bằng
A.1
B.-2
C.-1
D.5
* Đáp án
D
* Hướng dẫn giải
\(\int\limits_1^6 {f\left( x \right)dx} = \int\limits_1^2 {f\left( x \right)dx} + \int\limits_2^6 {f\left( x \right)dx} = 5\)