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Câu hỏi: Cho $\int\limits_{0}^{1}{f\left( x \right)\text{d}x}=2$ và $\int\limits_{0}^{1}{g\left( x \right)\text{d}x}=5$, khi đó $\int\limits_{0}^{1}{\left[ f\left( x \right)-2g\left( x \right) \right]\text{d}x}$ bằng
A. $-3$.
B. $12$.
C. $-8$.
D. $1$.
A. $-3$.
B. $12$.
C. $-8$.
D. $1$.
Ta có: $\int\limits_{0}^{1}{\left[ f\left( x \right)-2g\left( x \right) \right]\text{d}x}=\int\limits_{0}^{1}{f\left( x \right)\text{d}x}-2\int\limits_{0}^{1}{g\left( x \right)\text{d}x}=2-2.5=-8$.
Đáp án C.