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Câu hỏi: Biết $\int\limits_{2}^{3}{f\left( x \right)\text{d}x=5.}$ Khi đó $\int\limits_{2}^{3}{\left[ 3-5f\left( x \right) \right]\text{d}x}$ bằng:
A. $-26.$
B. $-15.$
C. $-22.$
D. $-28.$
A. $-26.$
B. $-15.$
C. $-22.$
D. $-28.$
$\int\limits_{2}^{3}{\left[ 3-5f\left( x \right) \right]\text{d}x}=\int\limits_{2}^{3}{3}\text{d}x-5\int\limits_{2}^{3}{f\left( x \right)\text{d}x}=3-5.5=-22.$
Đáp án C.