通分x/a(x-y),y/b(y-x)

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通分x/a(x-y),y/b(y-x)通分x/a(x-y),y/b(y-x)通分x/a(x-y),y/b(y-x)x/a(x-y)=-xb/-ab(x-y)y/b(y-x)=ay/-ab(x-y)公因

通分x/a(x-y),y/b(y-x)
通分x/a(x-y),y/b(y-x)

通分x/a(x-y),y/b(y-x)
x/a(x-y)=- xb/-ab(x-y)
y/b(y-x)=ay/-ab(x-y)

公因式为ab(x-y)
即bx/[ab(x-y)]
y/ b(y-x)=-y/b(x-y)=-ay/[ab(x-y)]
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