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Câu hỏi: Nếu $\int_{0}^{1}{f\left( x \right)} \text{d}x=-2, \int_{0}^{1}{g\left( x \right)} \text{d}x=5$ thì $\int_{0}^{1}{\left[ f\left( x \right)+2g\left( x \right) \right]} \text{d}x$ bằng
A. $1$.
B. $-9$.
C. $-12$.
D. $8$.
A. $1$.
B. $-9$.
C. $-12$.
D. $8$.
$\int_{0}^{1}{\left[ f\left( x \right)+2g\left( x \right) \right]} \text{d}x=\int_{0}^{1}{f\left( x \right)} \text{d}x+2\int_{0}^{1}{g\left( x \right)} \text{d}x=-2+10=8.$
Đáp án D.