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2ab(3/4a^m+1-1/2b^m)-(2/3a^m+1-5/6b^m)*3ab怎么做
人气:431 ℃ 时间:2019-09-29 14:51:49
解答
2ab[3/4a^(m+1)-1/2b^m]-[2/3a^(m+1)-5/6b^m]*3ab
=3/2a^(m+2)b-ab^(m+1)-2a^(m+2)b+5/2ab^(m+1)
=3/2ab^(m+1)-1/2a^(m+2)b
=1/2ab[3b^m-a^(m+1)]
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