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Câu hỏi: Cho $\int\limits_{0}^{1}{f\left( x \right)\text{d}x}=2$ và $\int\limits_{0}^{1}{g\left( x \right)\text{d}x}=5$. Tính $\int\limits_{0}^{1}{\left( f\left( x \right)-2g\left( x \right) \right)\text{d}x}$.
A. $-8$.
B. $12$.
C. $1$.
D. $-3$.
A. $-8$.
B. $12$.
C. $1$.
D. $-3$.
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 A.