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x^3+5x^2-18
用“添拆项法”
人气:164 ℃ 时间:2020-05-13 19:58:24
解答
x^3+5x^2-18
=x^3+3x²+2x²-18
=x²(x+3)+2(x²-9)
=x²(x+3)+2(x-3)(x+3)
=[x²+2(x-3)](x+3)
=(x²+2x-6)(x+3)
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