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(x-y)²-(y-x)^4
=(x-y)²-(x-y)^4
=(x-y)²判扰型掘猜李银[1-(x-y)²]
=(x-y)²(1-x+y)(1+x-y)
=(x-y)²-(x-y)^4
=(x-y)²判扰型掘猜李银[1-(x-y)²]
=(x-y)²(1-x+y)(1+x-y)
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