10ˆ2x+10ˆ-y=(10^x)^2+1/(10^y)=2^2+1/3=4又1/3
10ˆ(x-y)=10^x/(10^y)=2/3
log5 24=lg24/lg5=(lg3+lg2^3)/(1-lg2)=(y+3x)/(1-x)