Jawabanmu

2014-03-19T20:13:30+07:00
20 : 4/5 + 2/10
= (20/1 : 4/5) + 2/10
= (20/1 x 5/4) + 2/10
= 100/4 + 2/10
= 25/1 + 2/10
= 250/10 + 2/10
= 252/10 

semoga membantu :)