已知2^m=3,2^n=4,则2^3m+3n的值是多少
问题描述:
已知2^m=3,2^n=4,则2^3m+3n的值是多少
答
2^(3m+3n)
=2^3m×2^3n
=(2^m)^3×(2^n)^3
=3^3×4^3
=27×64
=1728