>>234
log{3}(6)　=log(6)/log(3) =log(2*3)/log(3)={log(2)+log(3)}/log(3)=1+log(2)/log(3)
log{4}(8)=　log(8)/log(4) =log(2*4)/log(4)={log(2)+log(4)}/log(4)=1+log(2)/log(4)
log{5}(10)=log(10)/log(5)=log(2*5)/log(5)={log(2)+log(5)}/log(5)=1+log(2)/log(5)

一番右の式で比較。分母が大きい方が小さい。

log{5}(10) < log{4}(8) < log{3}(6)