[(x+y)(x-y)-(x-y+3)的平方+2y(x-y)]除以(-2y)

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[(x+y)(x-y)-(x-y+3)的平方+2y(x-y)]除以(-2y)

[(x+y)(x-y)-(x-y+3)的平方+2y(x-y)]除以(-2y)
[(x+y)(x-y)-(x-y+3)的平方+2y(x-y)]除以(-2y)
 

[(x+y)(x-y)-(x-y+3)的平方+2y(x-y)]除以(-2y)