已知3的m次方=6,27的n次方=2,求3的2m-3n的次方的值.急用!

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已知3的m次方=6,27的n次方=2,
3^m=6 3^2m=6^2
27^n=2
3^3n=2
3的2m-3n的次方的值
=3^2m/3^3n
=36/2=18