Cho \(a>0;\,\,b>0\) và \({{a}^{2}}+{{b}^{2}}=7ab\). Chọn mệnh đề đúng:
A.\(2\left( \ln a+\ln b \right)=\ln \left( 7ab \right)\)
B. \(3\ln \left( a+b \right)=\frac{1}{2}\left( \ln a+\ln b \right)\)
C.\(\ln \left( \frac{a+b}{3} \right)=\frac{1}{2}\left( \ln a+\ln b \right)\)
D. \(\ln \left( a+b \right)=\frac{3}{2}\left( \ln a+\ln b \right)\)
A.\(2\left( \ln a+\ln b \right)=\ln \left( 7ab \right)\)
B. \(3\ln \left( a+b \right)=\frac{1}{2}\left( \ln a+\ln b \right)\)
C.\(\ln \left( \frac{a+b}{3} \right)=\frac{1}{2}\left( \ln a+\ln b \right)\)
D. \(\ln \left( a+b \right)=\frac{3}{2}\left( \ln a+\ln b \right)\)
Loga
Hóa Học lớp 12
