Jawabanmu

2014-08-31T22:03:32+07:00
log 98 = log ( 72.2)            
= log72 + log 2
               
= 2 log 7 + log 2
= 2( 1/7log 10) + 1/2log 10
= 2/( 7log 2+ 7log 5) + 1/(2log 2 + 2log5)
= (2/a+
7log 5) + (1/a +2log5)