在(1-2x)（1+x）5的展开式中，x3的系数是 A. 20 B. -20 C. 10

在(1-2x)（1+x）⁵的展开式中，x³的系数是

A. 20 B. -20 C. 10 D. -10

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在(1-2x)（1+x）5的展开式中，x3的系数是 A. 20 B. -20 C. 10

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