9-12(x+y)+4(x+y)^2因式分解
人气:492 ℃ 时间:2020-03-25 02:27:25
解答
解
原式
=3²-2×3×2(x+y)+[2(x+y)]²
=[3-2(x+y)]²
=(3-2x-2y)²
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