计算2乘以2的m+1次方除以2的m次方

问题描述:

计算2乘以2的m+1次方除以2的m次方

2*2^(m+1)/2^m
=2*2^m*2/2^m
=2*2
=4

2*2^(m+1)/2^m
=2^(1+m+1-m)
=2^2
=4