问题一:8^m=(2^3)^m=(2^m)^3=5^3=125
问题二:如果求的是求2的m+2n次方的值
2^(m+2n)=2^m×2^(2n)=2^m×(2^n)^2=5×3^2=45
(1)8的m次方
=(2³)的m次方
=(2的m次方)³
=5³
=125
(2)求2的m+2n次方的值
=2的m次方×(2的n次方)²
=5×3²
=45
8^m
=(2^3)^m
=(2^m)^3
=5^3
=125
2^(m+2n)
=2^m*2^2n
=2^m*(2^n)^2
=5*3^2
=5*9
=45