3ab^2-5a^b怎么算
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3ab^2-5a^b怎么算
3ab^2-5a^b怎么算
3ab^2-5a^b怎么算
3ab^2-5a^b
=ab(3b-5a)
题目应该是3ab^2-5a^2b
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-ab(a^2b^5-ab^3-b)