[(x+y)(x-y)-(x-y)²+2y(x-y)]÷4y
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[(x+y)(x-y)-(x-y)²+2y(x-y)]÷4y
[(x+y)(x-y)-(x-y)²+2y(x-y)]÷4y
[(x+y)(x-y)-(x-y)²+2y(x-y)]÷4y
x-y 这是小学题目么?
[(x+y)(x-y)-(x-y)²+2y(x-y)]÷4y
[(x+y)(x-y)-(x-y)²+2y(x-y)]÷4y
[(x+y)(x-y)-(x-y)²+2y(x-y)]÷4y
x-y 这是小学题目么?