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初中数学：若x-y=2，x²+y²=4，怎么求x2020+y2020的值？套公式
初中数学：若x-y=2，x²+y²=4，怎么求x2020+y2020的值？套公式
初中数学，完全平方公式，基础训练，培优专题116/139
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