【(x-y)^2+(x+y)(x-y)】除以 2x
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【(x-y)^2+(x+y)(x-y)】除以 2x
【(x-y)^2+(x+y)(x-y)】除以 2x
=(x-y)*(x-y+x+y)/2x
=(x-y)*2x/2x
=x-y
=(x-y)*(x-y+x+y)/2x
=(x-y)*2x/2x
=x-y
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