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\cdot $ B. $4\cdot $ C. $2\cdot $ D. $8\cdot $
$\int\limits_{0}^{1}{2f\left( x \right)\text{d}x}=2\int\limits_{0}^{1}{f\left( x \right)\text{d}x}=8$.
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