[12(x+y)³+3(x+y)(x-y)²]÷6(x+y)
人气:408 ℃ 时间:2020-04-01 08:17:02
解答
[12(x+y)³+3(x+y)(x-y)²]÷6(x+y)
=2(x+y)²+(x-y)²/2
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