Jawabanmu

2014-06-06T19:07:00+07:00
Log 90 =log 9×10= log10 + log9 = 1+log3² = 1 + 2×log 3 = 1 + 2×0,477 = 1+ 0,954 = 1,594

2014-06-06T19:33:17+07:00
Log 90= log (3x3x5x2)
=log 3+log 3+log 5+log2
=0,477+0,477+0,699+log 2
=1,653+log 2
=1,653+0,301
=1,954