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数学
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4(x+y)^2+25-20(x+y)怎么解,
人气:489 ℃ 时间:2020-04-13 06:56:44
解答
4(x+y)^2+25-20(x+y)
=[2(x+y)]²-2×2(x+y)×5+5²
=[2(x+y)-5]²
=(2x+2y-5)²
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