3log25×5log81+4log2÷3log36-3log4

=2x3log5x5log81+4log2:3log36-3log4
=2x3log81+1/2 : 3log9
=2x4+1/2 : 2
=8+1/2 : 2
=8+1/4
=33/4

3log25x5log81+4log2:3log36-3log4==>
4,20x9,54+1,20:4,67-1,80 kerjakan yg kali dan bagi dulu
40,068+0,25-1,80=38,518...