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Câu hỏi: Nếu $\int\limits_{0}^{4}{f\left( x \right)\text{ d}x=5}$ và $\int\limits_{0}^{4}{g\left( x \right)\text{ d}x=6}$ thì $\int\limits_{0}^{4}{\left[ 2f\left( x \right)+3g\left( x \right) \right]\text{ d}x}$ bằng
A. $11$.
B. $21$.
C. $27$.
D. $28$.
A. $11$.
B. $21$.
C. $27$.
D. $28$.
$\int\limits_{0}^{4}{\left[ 2f\left( x \right)+3g\left( x \right) \right]\text{ d}x}=2\int\limits_{0}^{4}{f\left( x \right)\text{ d}x+3\int\limits_{0}^{4}{g\left( x \right)\text{ d}x=2.5+3.6=28}}$.
Đáp án D.
