求学霸,八下,数学
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y/(x-y)+x/(x-2xy+xy)÷(xy+y)/(y-x)
=y/(x-y)-x/[x(x-y)]×(x-y)(x+y)/[(x+y)y]
=y/(x-y)-x[(x-y)y]
=(y-x)/[(x-y)y]
=-(x+y)/y
当x=5/2,y=10/3时
原式=-7/4
=y/(x-y)-x/[x(x-y)]×(x-y)(x+y)/[(x+y)y]
=y/(x-y)-x[(x-y)y]
=(y-x)/[(x-y)y]
=-(x+y)/y
当x=5/2,y=10/3时
原式=-7/4
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