Biết \({\log _2}3 = a\), \({\log _3}5 = b\). Khi đó \({\log _{15}}12\) bằng:
A.\(\dfrac{{a + 2}}{{ab + 1}}\)
B.\(\dfrac{{ab + 1}}{{a + 2}}\)
C.\(\dfrac{{a + 2}}{{a\left( {b + 1} \right)}}\)
D.\(\dfrac{{a\left( {b + 1} \right)}}{{a + 2}}\)
A.\(\dfrac{{a + 2}}{{ab + 1}}\)
B.\(\dfrac{{ab + 1}}{{a + 2}}\)
C.\(\dfrac{{a + 2}}{{a\left( {b + 1} \right)}}\)
D.\(\dfrac{{a\left( {b + 1} \right)}}{{a + 2}}\)
Loga
Hóa Học lớp 12
