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因式分解 求过程
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2016-08-22 · 知道合伙人教育行家
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x³-3x²-16x-12
=x³+2x²-5x²-10x-6x-12
=x²(x+2)-5x(x+2)-6(x+2)
=(x+2)(x²-5x-6)
=(x+2)(x+1)(x-6)
=x³+2x²-5x²-10x-6x-12
=x²(x+2)-5x(x+2)-6(x+2)
=(x+2)(x²-5x-6)
=(x+2)(x+1)(x-6)
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