"2∧a>2∧b”是log∨2a>log∨ 2b”什么条件?
已知log∨2^3=a,3^b=7,求log∨12^56
对数函数题 log a - log b = 3 log (c/2) 求 a = ______________
2log(b)x=log(a)x+log(c)x
log(8)a+log(4)b^2=5,log(8)b+log(4)a^2=7,求log(2)ab的值
已知log(2)3=a,log(3)7=b,试用a,b表示log(14)56
设log(2)(3)=a,log(3)(7)=b,以a,b表示log(21)(56)
[log (底数为a) x]=[1\2log (底数为a) b ] - [ log (底数为a)c]求X
已知a、b、c为直角三角形三边,c为斜边.log(a+b)+log(c-b)=2log(b+c)alog(c-b)a
27-1/ 若a>0,b>0,a*b>1,log(1/2)[a]=ln2,则log(a)[b]与log(1/2)[a]的
(1)利用关系式log(a)N=ba^b=N证明换底公式 log(a)N=log(m)N/log(m)a (2)利用(1
已知log(3)2=a log(5)2=b用ab表示log(30)90
log(2)(a)=log(3)(b)=log(5)(c)