log(7,5)和log(5,7)哪个大?

log(7,5)和log(5,7)哪个大? [log(5)√2·log(49)81]/[log(25)(1/3)·log(7)三倍根号四] 1/2的-0.8次方和log以5为底4的对数哪个大? log(1/4)(8/7) 和log（1/5）（6/5）大小 化简1/log 7+1/log 7+1/log 7 5 3 2 log(8)a+log(4)b^2=5,log(8)b+log(4)a^2=7,求log(2)ab的值 指数与对数计算题log√2*√3log√3*√4log√4*√5log√5*√6log√6*√7log√7*√8log√ log(a**3b**7),log(a**5b**12)和log(a**8b**15)是头三个等差数列中的数, log(6)7和log(7)6的大小 比较log(0.3)7和log(9)7的大小 log底数为7真数为5和log底数为6真数为7比较大小 已知log（14）7=a log(14)5=b 用ab表示log(35)70=