8^m*4^n
=(2^3)^m*(2^2)^n
=2^(3m)*2^(2n)(幂的乘方法则)
=2^(3m+2n)(同底数幂的乘法法则)
=2^4(代入)
=16.
若3m+2n=4,则8^m*4^n=?
3个回答
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