Khẳng định sai là
A. $\displaystyle \ln x<0\Leftrightarrow 0<x<1$.
B. $\displaystyle {{\log }_{\frac{1}{3}}}a>{{\log }_{\frac{1}{3}}}b\Leftrightarrow a>b>0$.
C. $\displaystyle \ln x>0\Leftrightarrow x>1$.
D. $\displaystyle {{\log }_{\frac{1}{8}}}a={{\log }_{\frac{1}{8}}}b\Leftrightarrow a=b>0$.
A. $\displaystyle \ln x<0\Leftrightarrow 0<x<1$.
B. $\displaystyle {{\log }_{\frac{1}{3}}}a>{{\log }_{\frac{1}{3}}}b\Leftrightarrow a>b>0$.
C. $\displaystyle \ln x>0\Leftrightarrow x>1$.
D. $\displaystyle {{\log }_{\frac{1}{8}}}a={{\log }_{\frac{1}{8}}}b\Leftrightarrow a=b>0$.
Loga
Hóa Học lớp 12
