计算(1)log327+ lg 1002+ log21 (2)lg 5+lg 2+ log2 18-log2 9 (3)
计算:lg(1/2)-lg(5/8)+lg(12.5)+log2为底3*log3为底8=
(lgx)/(lg1/2)=lg(x)/-(lg2)=-(lg(x)/lg(2))=-log2(x)
27^2/3-2^log2^3xlog2^1/8+lg^4+2lg^5等于
解下列方程:(1)log2(4-x)-log4(x-1)=1 (2)2lg(2x-1)=lg(-2x+7)+lg(x+1
(1)已知lg 2=a,lg 3=b,试用a,b表示log12 5 (2)已知log2 3=a,log3 7=b试用a,
高一对数运算:计算lg^3(2)+lg^3(5)+3lg(2)lg
像lg[(-2)(-3)]和lg(-5)^2的对数能否计算?怎样算?
1/2lg32/49-4/3lg根号8+lg根号245+2的1+log2 3
计算 2(lg√2)^2+lg√2 * lg5+√[(lg√2)^2-lg2+1]
(lgx)^2 ,lg(lgx) ,lg(x^2) (1
求值 lg 2lg 50 + lg 5lg 20 - lg 100lg 5lg 2
2(lg根号2)²+lg根号2*lg5+lg(5根号2)=?