Gaokao Math Practice Question
4. (5 分) $(\mathrm{x}+\mathrm{y})(2 \mathrm{x}-\mathrm{y})^{5}$ 的展开式中的 $x^{3} \mathrm{y}^{3}$ 系数为 $(\quad)$
- A.-80
- B.-40
- C.40
- D.80
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