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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 $\int\limits_{0}^{1}{\left[ 5f\left( x \right)-g\left( x \right) \right]}\text{ d}x$ bằng
A. $1$.
B. $3$.
C. $5$.
D. $-3$.
A. $1$.
B. $3$.
C. $5$.
D. $-3$.
Ta có $\int\limits_{0}^{1}{\left[ 5f\left( x \right)-g\left( x \right) \right]}\text{ d}x=5\int\limits_{0}^{1}{f\left( x \right)\text{d}x}-\int\limits_{0}^{1}{g\left( x \right)\text{d}x}=5.2-5=5$.
Đáp án C.