作业帮计算:12xy^2/(x+y) * (x^2 - y^2)/4xy
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计算:12xy^2/(x+y) * (x^2 - y^2)/4xy
计算:12xy^2/(x+y) * (x^2 - y^2)/4xy
计算:12xy^2/(x+y) * (x^2 - y^2)/4xy
12xy^2/(x+y) * (x^2 - y^2)/4xy
=12xy^2/(x+y) * (x - y)（x+y)/4xy
=3y(x-y)
利用x^2-y^2=(x-y)(x+y)直接化简
3xy-3y^2
该式=(4x*3y2)/(x+y)*[(x+y)(x-y)]/4x=3y2(x-y)自己为您算的哦
12xy^2/(x+y) * (x^2 - y^2)/4xy
=12xy^2/(x+y) * (x - y)（x+y)/4xy
=3y(x-y)