2^x=34^y=2^(2y)=5所以2^(x-2y)=2^x÷2^(2y)=3/5
解:2^(x-2y)=(2^x)/(2^(2y))=(2^x)/(4^y)=3/5
2^(x-2y)=2^x÷4^y=3÷5=0.6
2^x=34^y=52^2y=52^x/2^2y=3/52^(x-2y)=3/5