3x²+2xy²+4x²y+xy²-4x²y
=3x²+3xy²
3x的二次方+2xy的平方+4x的二次方y+xy的二次方—4x的二次方y合并同类项
3x的二次方+2xy的平方+4x的二次方y+xy的二次方—4x的二次方y合并同类项
数学人气：543 ℃时间：2019-12-06 08:52:40
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