已知2m=3,2n=5,求 23m+2n的值.

问题描述:

已知2m=3,2n=5,求 23m+2n的值.

∵2m=3,2n=5,
∴23m+2n
=23m×22n
=(2m3×(2n2
=33×52
=27×25
=675.