x²-y² = (x-y)(x+y)
y/x-y = y(x+y)/(x-y)(x+y) = yx+y²/xx²-y²
4)Другой ответ
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x²-y² = (x-y)(x+y)
y/x-y = y(x+y)/(x-y)(x+y) = yx+y²/xx²-y²
4)Другой ответ