字典翻译 问答 合并同类项:4(x-y)-3(x+y)²+3(x-y)+2(x+y)²
问题标题:
合并同类项:4(x-y)-3(x+y)²+3(x-y)+2(x+y)²
问题描述:

合并同类项:4(x-y)-3(x+y)²+3(x-y)+2(x+y)²

黄福奎回答:
  4(x-y)-3(x+y)²+3(x-y)+2(x+y)²   =4(x-y)+3(x-y)-3(x+y)²+2(x+y)²   =7(x-y)-(x+y)²
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