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Câu hỏi: Nếu $\int\limits_{0}^{2}{f\left( x \right)\text{d}x}=-3$ thì $\int\limits_{0}^{2}{\left[ 3f\left( x \right)-2 \right]\text{d}x}$ bằng
A. $-7$.
B. $-11$.
C. $-13$.
D. $-9$.
A. $-7$.
B. $-11$.
C. $-13$.
D. $-9$.
Ta có $\int\limits_{0}^{2}{\left[ 3f\left( x \right)-2 \right]\text{d}x}=3\int\limits_{0}^{2}{f\left( x \right)\text{d}x}-2\int\limits_{0}^{2}{\text{d}x}=3.\left( -3 \right)-\left. 2x \right|_{0}^{2}=-9-4=-13$.
Đáp án C.