Nếu ${\int }_0^{1}2f(x)dx=6$ thì ${\int }_0^1\left[\frac{1}{3}f(x)+2x\right]dx$ bằng

**Chọn D**

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Ta có ∫ f ( x ) + 2 x dx = ∫ f ( x ) dx + 2 ∫ xdx = ∫ 2 f ( x ) dx + x 2 = .6 + 1 = 2 .
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