[(x+y)(x-y)]的七次除以[(-x-y)(x-y)]的五次-2(-xy)的平方,其中x=2y=-1,

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[(x+y)(x-y)]的七次除以[(-x-y)(x-y)]的五次-2(-xy)的平方,其中x=2y=-1,
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[(x+y)(x-y)]的七次除以[(-x-y)(x-y)]的五次-2(-xy)的平方,其中x=2y=-1,
[(x+y)(x-y)]的七次除以[(-x-y)(x-y)]的五次-2(-xy)的平方,其中x=2y=-1,

[(x+y)(x-y)]的七次除以[(-x-y)(x-y)]的五次-2(-xy)的平方,其中x=2y=-1,