若2的x次方=3，2的y次方=5，求2的x+y+2次方的值

Question

如题所述

Answer 1

因为

2^x=3

2^y=5

2^(x+y+2)=2^x*2^y^4

=5*3*4

=15*4

=60

追问

求(-5m的n+1次方n)(-2mn)的值

追答

Answer 2

2的x次方=3，2的y次方=5，
2的x+y+2次方
=2的x次方×2的y次方×2²
=3×5×4
=60