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因式分解:4+ 12(x-y)+9(x-y)(x-y)
人气:228 ℃ 时间:2020-01-27 04:27:00
解答
4+ 12(x-y)+9(x-y)²
=[3(x-y)]²+2×[3(x-y)]×2+2²
=[3(x-y)+2]²
=(3x-3y+2)²
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