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Câu hỏi: Cho $I=\int\limits_{0}^{2}{f\left( x \right)\text{d}x=3}$. Khi đó $J=\int\limits_{0}^{2}{\left[ 4f\left( x \right)-3 \right]\text{d}x}$ bằng:
A. $2$.
B. $6$.
C. $8$.
D. $4$.
A. $2$.
B. $6$.
C. $8$.
D. $4$.
$J=\int\limits_{0}^{2}{\left[ 4f\left( x \right)-3 \right]\text{d}x}=4\int\limits_{0}^{2}{f\left( x \right)\text{d}x-}\int\limits_{0}^{2}{\text{3d}x=12-6=6.}$.
Đáp án B.