(x-y)(x+y)+(x-y)的平方-(6x方y方+4xy方)除以4xy
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(x-y)(x+y)+(x-y)的平方-(6x方y方+4xy方)除以4xy
(x-y)(x+y)+(x-y)的平方-(6x方y方+4xy方)除以4xy
(x-y)(x+y)+(x-y)的平方-(6x方y方+4xy方)除以4xy
(x-y)(x+y)+(x-y)的平方-(6x方y方+4xy方)除以4xy
=x²-y²+x²-2xy+y²-3/2xy-y
=2x²-7/2xy-y
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