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Câu hỏi: Nếu $\int\limits_{1}^{4}{f\left( x \right)\text{d}x}=-2$ thì giá trị của $I=\int\limits_{1}^{4}{\left[ \dfrac{3}{2}f\left( x \right)+1 \right]\text{d}x}$ bằng
A. $-2$.
B. $-6$
C. $0$.
D. $3$.
A. $-2$.
B. $-6$
C. $0$.
D. $3$.
$I=\int\limits_{1}^{4}{\left[ \dfrac{3}{2}f\left( x \right)+1 \right]\text{d}x}=\dfrac{3}{2}\int\limits_{1}^{4}{f\left( x \right)\text{d}x}+\left. x \right|_{1}^{4}=\dfrac{3}{2}.\left( -2 \right)+4-1=0$.
Đáp án C.