已知3*9^m*27^m=3^21,则m=
人气：216 ℃ 时间：2020-03-13 02:59:08
解答
3*9^m*27^m
=3*(3^2)^m*(3^3)^m
=3*3^2m*3^3m
=3^(1+2m+3m)
=3^21
1+2m+3m=21
m=4
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