计算9（x-1）²-（3x+3）（3x-1）
人气：217 ℃ 时间：2020-04-08 20:24:44
解答
原式=9（x²-2x+1）-（9x²-3x+9x-3）
=9x²-18x+9-9x²+3x-9x+3
=-24x12
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