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数学
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因式分解(x+2y)^2-4x^2
人气:348 ℃ 时间:2019-12-29 16:38:41
解答
(x+2y)²-4x²
=(x+2y)²-(2x)²
={(x+2y)+2x}·{(x+2y)-2x}
=(3x+2y)(-x+2y)
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