Jawabanmu

2014-06-23T02:36:01+07:00
1. 90x-180=80x-150     90x-80x=180-150  10x=30  x=30/10 x=3
2. 100% x 100= 100/100 x 100 = 100
3. 99x99/99-99+99= 99
4. sederhanakan 12/4
= 3