Jawabanmu

2014-09-11T07:17:35+07:00
10 + 40 - 20 : 5 x 10 = 10
10 = 10
2014-09-11T07:24:04+07:00
10 + 40 - 20 : 5 x 10
= 10 + 40 - 4 x 10
= 10 + 40 - 40
= 10