( x/y - y/x )除以x-y/x结果是
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(x/y-y/x)除以x-y/x结果是(x/y-y/x)除以x-y/x结果是(x/y-y/x)除以x-y/x结果是解(x/y-y/x)÷(x-y)/x=[(x²-y²)/xy]×x
( x/y - y/x )除以x-y/x结果是
( x/y - y/x )除以x-y/x结果是
( x/y - y/x )除以x-y/x结果是
解
(x/y-y/x)÷(x-y)/x
=[(x²-y²)/xy]×x/(x-y)
=(x-y)(x+y)/xy×x/(x-y)
=(x+y)/y
原式=[(x^2-y^2)/xy]*[x/(x-y)=[(x+y)(x-y)/xy]*[x/(x-y)]=(x+y)/y
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