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Câu hỏi: Cho ${\int\limits_{2}^{5}{f\left( x \right)\text{d}x}=10}$. Khi đó ${\int\limits_{5}^{2}{\left[ 2-4f\left( x \right) \right]\text{d}x}}$ bằng :
A. $36$.
B. $40$.
C. $34$.
D. $32$.
${\int\limits_{5}^{2}{\left( 2-4f\left( x \right) \right)}\text{d}x=2\int\limits_{5}^{2}{\text{d}x}-4\int\limits_{5}^{2}{f\left( x \right)}\text{d}x=-6+40=34}$.
A. $36$.
B. $40$.
C. $34$.
D. $32$.
${\int\limits_{5}^{2}{\left( 2-4f\left( x \right) \right)}\text{d}x=2\int\limits_{5}^{2}{\text{d}x}-4\int\limits_{5}^{2}{f\left( x \right)}\text{d}x=-6+40=34}$.
Đáp án C.