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Câu hỏi: Nếu $\int\limits_{0}^{2}{f\left( x \right)\text{d}x}=5$, $\int\limits_{0}^{2}{g\left( x \right)\text{d}x}=2$ thì $\int\limits_{0}^{2}{\left[ f\left( x \right)-2g\left( x \right) \right]\text{d}x}$ bằng
A. 7.
B. 9.
C. 1.
D. 3.
A. 7.
B. 9.
C. 1.
D. 3.
Ta có: $\int\limits_{0}^{2}{\left[ f\left( x \right)-2g\left( x \right) \right]\text{d}x}$ $=\int\limits_{0}^{2}{f\left( x \right)\text{d}x}-2\int\limits_{0}^{2}{g\left( x \right)\text{d}x}$ $=5-2.2$ $=1$.
Đáp án C.