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Câu hỏi: Nếu $\int\limits_{0}^{2}{f\left( x \right)\text{d}x}=2$ thì $\int\limits_{0}^{2}{\left[ 3f\left( x \right)-2 \right]\text{d}x}$ bằng
A. 2.
B. 8.
C. 4.
D. 6.
A. 2.
B. 8.
C. 4.
D. 6.
Ta có $\int\limits_{0}^{2}{\left[ 3f\left( x \right)-2 \right]\text{d}x}=3\int\limits_{0}^{2}{f\left( x \right)\text{d}x}-\int\limits_{0}^{2}{2\text{d}x}=3.2-4=2$.
Đáp án A.