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Câu hỏi: Cho $\int\limits_{2}^{5}{f\left( x \right)}d\text{x=10}$. Khi đó $\int\limits_{2}^{5}{\left[ 2+3f\left( x \right) \right]}d\text{x}$ bằng
A. $32$.
B. $36$.
C. $42$.
D. $46$.
A. $32$.
B. $36$.
C. $42$.
D. $46$.
Ta có $\int\limits_{2}^{5}{\left[ 2+3f\left( x \right) \right]}d\text{x = }\int\limits_{2}^{5}{2.d\text{x}}+3\int\limits_{2}^{5}{f\left( x \right)}d\text{x = 6 +3}\text{.10 =36}$.
Đáp án B.