(x²-1)(y²-1)化简

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(x²-1)(y²-1)化简(x²-1)(y²-1)化简(x²-1)(y²-1)化简=(x+1)(x-1)(y+1)(y-1)(x+1)(x

(x²-1)(y²-1)化简
(x²-1)(y²-1)化简

(x²-1)(y²-1)化简
=(x+1)(x-1)(y+1)(y-1)

(x+1)(x-1)(y+1)(y-1)

(x+1)(x-1)(y+1)(y-1)