Jawabanmu

2014-04-11T13:29:17+07:00
3 1/2 x + x = 90
4 1/2 x = 90
x = 90 / 4,5 = 20
3,5 x 20 = 70 derajat
2014-04-11T13:32:53+07:00
3 1/2x + x=90 4 1/2 x=90 x=90/ 4 1/2 x=20