Kerjakan ya pliss dgn cara kerja

9. 1 - (1/3 + 1/4)
= 1 - (4/12 + 3/12)
= 1 - 7/12

10. 3 - (5/6 - 2/3) = 3 - (5/6 - 4/6)
= 3 - 1/6
= 18/6 - 1/6
= 17/6

11. (1/2 + 1/3) ÷ 5
= (3/6 + 2/6) ÷ 5
= 5/6 ÷ 5
= 5/6 × 1/5
= 1/6

12. (1/4 + 1/8) × 8
= (2/8 + 1/8) × 8
= 3/8 × 8
= 3

13. 3 × (2/3 - 7/12)
= 3 × (8/12 - 7/12)
= 3 × 1/12
= 1/4

14. 10 ÷ (1/2 + 1/8)
= 10 ÷ (4/8 + 1/8)
= 10 ÷ 5/8
= 10 × 8/5
= 16

15. 1 ÷ (1/3 + 7/12)
= 1 ÷ (4/12 + 7/12)
= 1 ÷ 11/12
= 1 × 12/11
= 12/11