已知3的m次方=6 27的n次方=2 求3的2m-2n次方的值

3的2m-4n+1次方
=3^2m÷3^4n×3
=(3^m)^2÷(9^n)^2×3
=6^2÷2^2×3
=36÷4×3
=27
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