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

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