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数学
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[(x+2y)(-2y)+(x-2y)²]÷(6x)
人气：402 ℃ 时间：2020-05-25 16:44:46
解答
=(-2xy-4y²+x²-4xy+4y²)÷(6x)
=(-6xy+x²)÷(6x)
=-y+x/6
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