若a的m次方=27,a的n次方=3,则a的2m-3n=
问题描述:
若a的m次方=27,a的n次方=3,则a的2m-3n=
答
a的2m-3n
=a^2m÷2^3n
=(a^m)^2÷(2^n)^3
=27^2÷3^3
=27
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