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(a**3b**7),log(a**5b**12)和log(a**8b**15)是头三个等差数列中的数,第12个数是log(b**n) 请找出n ..可能的答案为a.40 b.56 c.76 d .112 e.143**3 代表

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) 已知log(2)3=a,log(3)7=b试用a,b表示log(2)14 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 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 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 对数函数题 log a - log b = 3 log (c/2) 求 a = ______________ a=log(3)π b=log(7)6 c=log(2)0.8 哪一个大, log那块的数学题已知lg2=a lg3=b 试用a b 表示log(12)5已知log(2)3=a log(3)7=b 试用a b表示log(14)56括号里是底 log(2)5=a,log(2)7=b用ab表示log(35)28 已知log∨2^3=a,3^b=7,求log∨12^56 log(8)a+log(4)b^2=5,log(8)b+log(4)a^2=7,求log(2)ab的值 log a 2/3 log a(2/3) 设a>b>1,log(a)b+log(b)a=10/3,则log(a)b-log(b)a= 已知a＜b＜1,log(a)b+log(b)a=10/3,求log(a)b-log(b)a的值括号为下标, 1≤a≤b≤c,证明log(a)(b)+log(b)(c)+log(c)(a)≤log(b)(a)+log(c)(b)+log(a)(c) a,b,x 都是正数,4[log(a)x]²+[3log(b)x]²=8log(a)x*log(b)x,则a,b的关系