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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 $\int\limits_{0}^{1}{\left[ f\left( x \right)+2g\left( x \right) \right]\text{d}x}$ bằng
A. $-3$.
B. $-8$.
C. $12$.
D. $1$.
A. $-3$.
B. $-8$.
C. $12$.
D. $1$.
Ta có: $\int\limits_{0}^{1}{\left[ f\left( x \right)+2g\left( x \right) \right]\text{d}x}=\int\limits_{0}^{1}{f\left( x \right)\text{d}x}+2\int\limits_{0}^{1}{g\left( x \right)\text{d}x}=2+2.5=12$.
Đáp án C.