【已知9^m*27^m-1的值27,求m】

发布时间:2021-03-17 05:39:11

已知9^m*27^m-1的值27,求m

网友回答

9^m×27^(m - 1) = 27
3^(2m)×3^(3m - 3) = 27
3^(2m + 3m - 3) = 27
3^(5m - 3) = 27
3^(5m - 3) = 3^3
5m - 3 = 3
5m = 6m = 6÷5m = 1.2
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