作业帮由换底公式怎么得到log9(x+5)=log3[2（x+5)]=1/2log3(x+5)
由换底公式怎么得到log9(x+5)=log3[2（x+5)]=1/2log3(x+5)
(log2^3 +log3^5) x ( log3^5 +log9^5 ) x lg 2 ,
log 243÷log9 =log3^5÷log3^2 =log3^5-log3^2 然后怎么写
填空题：方程log3(x-1)=log9(x+5)的解是____________
log3 5-log3 15+1/2log9 27 的值
关于对数函数log3 (x^2+2)=log3 x+1以log3为底
求x,y值.6log9^x+3log27^y=8log3^x+2log9^y=2
解不等式:log3^(5+x)+log3^(x-1)≤3
求对数方程根log3为底(x^2-10)=1+log3为底x
log2(3)+log3(5)+log3(2)=?
解不等式（2+log3 x)log3 x>log3 (9x)
(log2(3)+log8(9))x(log3(4)+log9(8)+log3(2))