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Câu hỏi: Nếu $\int\limits_{2}^{5}{f\left( x \right)\text{d}x}=3$ và $\int\limits_{2}^{5}{g\left( x \right)\text{d}x}=-2$ thì $\int\limits_{2}^{5}{\left( 2f\left( x \right)+g\left( x \right) \right)\text{d}x}$ bằng
A. $-5$.
B. $1$.
C. $4$.
D. $8$.
A. $-5$.
B. $1$.
C. $4$.
D. $8$.
Ta có $\int\limits_{2}^{5}{\left( 2f\left( x \right)+g\left( x \right) \right)\text{d}x}=\int\limits_{2}^{5}{2f\left( x \right)\text{d}x}+\int\limits_{2}^{5}{g\left( x \right)\text{d}x}=2.3+\left( -2 \right)=4$.
Đáp án C.