作业帮log3 7·log2 9·log49 a=log4 1/2,则a=
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log3 7·log2 9·log49 a=log4 1/2,则a=
log3 7·log2 9·log49 a=log4 1/2,则a=
log3 7·log2 9·log49 a=log4 1/2,则a=
若log3 7·log2 9·log49 a=log4 1/2,则有：
(lg7/lg3)·(lg9/lg2)·(lga/lg49)=lg(1/2)/lg4
即：(lg7/lg3)·(2lg3/lg2)· lga/(2lg7)=-lg2/(2lg2)
化简得：lga/lg2=-1/2
即：lga=(-1/2)lg2=-lg根号2=lg(根号2)/2
所以：a=(根号2)/2
log3 7·log2 9·log49 a=log4 1/2,则a=
log3^7乘以log2^9乘以log49^2=
log3^7乘以log2^9乘以log49^2=
若log3(7)·log2(9)·log49(a)=log4(1/2),则a的值等于
若log3(7)·log2(9)·log49(a)=log4(1/2),则a的值等于没有过程没关系,
若log3(7)*log2(9)*log49(a)=log4(1/2),则a=?
log2^9*log3^8
2道高一对数基础计算题~help,1.已知loga^5=-1/2.log5^b=-1/2.lg2=0.3,求lgb/a2.设log3^7log2^9log49^m=log4^1/2,求实数m的值
(log3 4+log3 8)(log2 3+log2 9)+(log3 根号2)(log9 7)/(log1/3 7)(log三次根号4 8)
比大小.log2 7 和log3 7
log2 9乘以log3 4等于多少
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Log2013[Log2(log3的9次方)_
log2^3*log3^7*log7^8
log2 3×log3 7=log2 7这个算法对吗
(log3^4+log5^2)(log2^9+log2^根号3)
log2 3 · log3 4 ·log4 5 ·log5 2 前面的是底数