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因式分解9(x-y)²+12(x²-y²)+4(x+y)²
人气:239 ℃ 时间:2020-01-28 06:23:22
解答
原式=[3(x-y)]²+12(x+y)(x-y)+[2(x+y)]²
=[3(x-y)+2(x+y)]²
=(5x-y)²
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