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Câu hỏi: Nếu $\int_{a}^{b}{f\left( x \right)} \text{d}x=2$ và $\int_{a}^{b}{g\left( x \right) }\text{d}x=3$ thì $\int_{a}^{b}{\left[ 5f\left( x \right)-2g\left( x \right) \right]} \text{d}x$ bằng bao nhiêu?
A. 8.
B. 16.
C. 4.
D. 11.
A. 8.
B. 16.
C. 4.
D. 11.
$\int_{a}^{b}{\left[ 5f\left( x \right)-2g\left( x \right) \right]} \text{d}x=5\int\limits_{a}^{b}{f\left( x \right) \text{d}x}-2\int\limits_{a}^{b}{g\left( x \right) \text{d}x}=5.2-2.3=4$.
Đáp án C.