计算2x-2y分之x+y-x方-y方分之x方+y方

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计算2x-2y分之x+y-x方-y方分之x方+y方
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计算2x-2y分之x+y-x方-y方分之x方+y方
计算2x-2y分之x+y-x方-y方分之x方+y方

计算2x-2y分之x+y-x方-y方分之x方+y方
2x-2y分之x+y-x方-y方分之x方+y方
=2(x-y)(x+y)分之(x+y)平方-2(x-y)(x+y)分之2(x方+y方)
=2(x-y)(x+y)分之(x方+2xy+y方-2x方-2y方)
=2(x-y)(x+y)分之-(x-y)方
=-2(x+y)分之(x-y)

y分之x

是不是2x+2y分之x-y啊!我也不知道对不对