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Nếu $\int\limits_{0}^{1}{f\left( x \right)\text{d}x}=4$ thì...

Câu hỏi: Nếu $\int\limits_{0}^{1}{f\left( x \right)\text{d}x}=4$ thì $\int\limits_{0}^{1}{2f\left( x \right)\text{d}x}$ bằng
A. $16$.
B. $4$.
C. $2$.
D. $8$.
Ta có: $\int\limits_{0}^{1}{2f\left( x \right)\text{d}x}=2\int\limits_{0}^{1}{f\left( x \right)\text{d}x}=2.4=8$.
Đáp án D.
 

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