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[tex]( \frac{x}{y^2} - \frac{1}{x} ):( \frac{1}{y} - \frac{1}{x} )[/tex]
[tex]( \frac{x}{y^2} - \frac{1}{x} ):( \frac{1}{y} - \frac{1}{x} )[/tex]
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1)x/y²-1/x=(x²-y²)/xy²2)1/y-1/x=(x-y)/xy
3)(x-y)(x+y)/xy²*xy/(x-y)=(x+y)/y