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分解因式:x^3+3x^2-3-1
人气:281 ℃ 时间:2020-05-09 06:09:43
解答
x^3+3x^2-3-1
=x^3-1+3(x^2-1)
=(x-1)(x^2+x+1)-3(x-1)(x+1)
=(x-1)(x^2+x-3x+1-3)
=(x-1)(x^2-2x-2)
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