a/x-y,b/3y-3x,c/x^2-2xy+y^2通分
题目
a/x-y,b/3y-3x,c/x^2-2xy+y^2通分
答案
a/x-yb/3y-3x=-b/3(x-y)c/x^2-2xy+y^2=c/(x-y)(x+y)的最简化分母为：3(x-y)(x+y)∴a/（x-y）=3a(x+y)/3(x-y)(x+y)b/3y-3x=-b/3(x-y)=-b(x+y)/3(x-y)(x+y)c/x^2-2xy+y^2=c/(x-y)(x+y)=3c/3(x-y)(x+y)
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