log24^45= log24^(5*9)=log24^5 + log24^9= 1／(log5^24) + 1／(log9^24)由 log12^9=a 、 12^b=5知：log9^12 = 1／a 、log12^5=b,即 log5^12= 1／b①log12^9=log12^(3*3)=log12^3 + log12^3 = 2* log12^3 = a 则：lo...