已知3的m次方为5,3的n次方为7,则3的m+n次方为?

问题描述:

已知3的m次方为5,3的n次方为7,则3的m+n次方为?

35,编程做的
[m,n,y]=solve('3^m=5','3^n=7','y=3^(m+n)')
m =
log(5)/log(3)
n =
log(7)/log(3)
y =
35