若2m=3,4n=8,则23m+2n-1=_.

问题描述:

若2m=3,4n=8,则23m+2n-1=______.

∵2m=3,4n=8,
∴23m=33=27,22n=4n=8,
则23m+2n-1=23m•22n÷2=27×8÷2=108.
故答案为:108.