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数学
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1.20y(2y-x)²与5x(x-2y)平方的公因式是—— 2.分解因式(x+y)(x-y)-(x+y)²
人气:218 ℃ 时间:2020-05-27 17:36:40
解答
20y(2y-x)²=20y(x-2y)²、5x(x-2y)²
公因式:5(x-2y)²
(x+y)(x-y)-(x+y)²=(x+y)(x-y-x-y)=(x+y)(-2y)=-2y(x+y)
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