Question

几道初一数学题1、若2的m次方=5,2的n次方=6,则a的2n次方=______,a的m+2n次方=______2、若2

Answer 1

a^(2n)=(a^n)^2=6^2=36

a^(m+2n)=a^m*(a^n)^2=5*36=180

2^x=4^(y+1)=2^(2y+2)

x=2y+2

27^y=3^(x-1)

3^(3y)=3^(x-1)

3y=x-1

x=2y+2

3y=x-1

x=4,y=1

x-y=4-1=3