Jawabanmu

2014-02-03T19:08:43+07:00
10 derajat+ 1/4 + 20 derajat = 40/4 derajat + 1/4 derajat + 80/4 derajat = 121/4 derajat
2014-02-03T19:34:02+07:00
10/1 + 1/4 + 20/1 =10/1 + 1/4 = 11/5
                          = 11/5 + 20/1 = 31/6