（x-3)(x+3)-(x-1)(x+1)
=x^2-9-(x^2-1)
=x^2-9-x^2+1
=-8
化简代数式（x-3)(x+3)-(x-1)(x+1)
化简代数式（x-3)(x+3)-(x-1)(x+1)
数学人气：417 ℃时间：2019-12-10 10:46:30
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