已知3^m=6,3^n=2,求3^2m-3n的值
人气：145 ℃ 时间：2020-04-15 10:57:35
解答
3^(2m-3n)
=3^2m/3^3n
=(3^m)^2/(3^n)^3
=6^2/2^3
=36/8
=9/2
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