log a(2/3)

log a 2/3 log a(2/3) 等比数列a+log(2)3,a+log(4)3,a+log(8)3求公比q. log(2)3=a,则log(6)4=（ 对数函数题 log a - log b = 3 log (c/2) 求 a = ______________ 证明对数运算法则（1）log(a)(MN)=log(a)(M)+log(a)(N); 　　（2）log(a)(M/N)=log(a)(M)-log(a)(N);（1）log(a)(MN)=log(a)(M)+log(a)(N); 　　（2）log(a)(M/N)=log(a)(M)-log(a)(N); 　　（3）log(a)(M^n)=nlog(a)(M) （n∈R） 已知log（14）7=a log(14)5=b 用ab表示log(35)70=log(3)4*log(4)8*log(8)m=log(4)2 求m 等比数列a+log(2)3,a+log(4)3,a+log(8)3,...的公比为多少? 若log(a+3)(2/3) 已知log(2a+3)1/2 已知log(2a+3)1/2 log底数a真数(3分之2) 设log（a）2/3下面 已知log（a）（2/3） 已知log（a）（2/3） log以a为底2/3 log(a)2 关于数学对数的换底公式推论的问题已知 log(2)(3) = a,log(3(7)=b,用a,b表示log(42)(56)因为log(2)(3)=a,则1/a=log(3)(2),又∵log(3)(7)=b,∴log(42)(56)=log(3)(56)/log(3)(42)=log(3)(7)+3·log(3)(2)/log(3)(7)+log(3)(2)+1=ab+3/ab+b+1