x³＋2x²－10x－2 用分组分解法因式分解
人气：288 ℃ 时间：2020-04-13 11:48:20
解答
x³+2x²-10x-20
=x³-10x+2x²-20
=x(x²-10)+2(x²-10)
=(x²-10)(x+2)
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