5a-2a的平方b-b的3次方+a的3次方b按a的降幂排列为?
急
人气：283 ℃ 时间：2020-01-17 19:44:29
解答
5a-2a的平方b-b的3次方+a的3次方b
=a的3次方b-2a的平方b+5a-b的3次方
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