[(x+y)(x-y)-(x-y)²+2y(x-y)]÷(-2y)
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[(x+y)(x-y)-(x-y)²+2y(x-y)]÷(-2y)
[(x+y)(x-y)-(x-y)²+2y(x-y)]÷(-2y)
[(x+y)(x-y)-(x-y)²+2y(x-y)]÷(-2y)
-2(x-y)
[(x+y)(x-y)-(x-y)²+2y(x-y)]÷(-2y)
[(x+y)(x-y)-(x-y)²+2y(x-y)]÷(-2y)
[(x+y)(x-y)-(x-y)²+2y(x-y)]÷(-2y)
-2(x-y)