Упростите выражение.
1/x-y * 1/x-y * ( x/y - y/x)
1/(x-y)*1/(x-y)*(x/y-y/x)
1/(x-y)^2 (x^2-y^2/xy)=1/(x-y)^2*((x-y)(x+y)/xy) =(x+y)/(x-y)(xy))
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1/(x-y)*1/(x-y)*(x/y-y/x)
1/(x-y)^2 (x^2-y^2/xy)=1/(x-y)^2*((x-y)(x+y)/xy) =(x+y)/(x-y)(xy))