ini gmn yaa kk sama caranya no 3 dan 4

3. 2 (4 + 30 ) x (15 - 5)
= 2 x 34 x 10
= 68 x 10
= 680
4. 66 - 2 x (13- 6) + 36
= 66 -2 x 7 + 36
= 66 - 14 + 36
= 52 + 36
= 88
....semoga membantu....