Google
Câu hỏi: Nếu $\int\limits_{2}^{6}{f\left( x \right)\text{d}x}=7$ và $\int\limits_{2}^{6}{g\left( x \right)\text{d}x}=-2$ thì $\int\limits_{2}^{6}{\left[ f\left( x \right)+g\left( x \right) \right]\text{d}x}$ bằng
A. $5$.
B. $-5$.
C. $-9$.
D. $9$.
A. $5$.
B. $-5$.
C. $-9$.
D. $9$.
Ta có: $\int\limits_{2}^{6}{\left[ f\left( x \right)+g\left( x \right) \right]\text{d}x}=\int\limits_{2}^{6}{f\left( x \right)\text{d}x}+\int\limits_{2}^{6}{g\left( x \right)\text{d}x}=7+\left( -2 \right)=5$
Đáp án A.