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