合并同类项:4(x-y)-3(x+y)²+3(x-y)+2(x+y)²
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合并同类项:4(x-y)-3(x+y)²+3(x-y)+2(x+y)²
合并同类项:4(x-y)-3(x+y)²+3(x-y)+2(x+y)²
合并同类项:4(x-y)-3(x+y)²+3(x-y)+2(x+y)²
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
合并同类项:4(x-y)-3(x+y)²+3(x-y)+2(x+y)²
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