约分:(1-x)^2 (1+x)^2/(x^2-1)^2

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约分:(1-x)^2(1+x)^2/(x^2-1)^2约分:(1-x)^2(1+x)^2/(x^2-1)^2约分:(1-x)^2(1+x)^2/(x^2-1)^2=(1-x)²(1+x)&#

约分:(1-x)^2 (1+x)^2/(x^2-1)^2
约分:(1-x)^2 (1+x)^2/(x^2-1)^2

约分:(1-x)^2 (1+x)^2/(x^2-1)^2
=(1-x)²(1+x)²/[(x+1)(x-1)]²
=1