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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 ${\int\limits_{0}^{1}{\left[ f\left( x \right)-2g\left( x \right) \right]\text{d}x} }$ bằng
A. $-8$
B. $1$
C. $-3$
D. $12$
A. $-8$
B. $1$
C. $-3$
D. $12$
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.