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