Jawaban:

1. 3 + (4+5) = (3+4) + 5

= 3 + 9 = 7 + 5

= 12 = 12

2. -6 + (2+7) = (-6+2) + 7

= -6 + 9 = -4 + 7

= 3 = 3

3. 7 + (5+9) = (7+5) + 9

= 7 + 14 = 12 + 9

= 21 = 21

4. -8 + (3+6) = (-8+3) + 6

= -8 + 9 = -5 + 6

= 1 = 1

5. 13 + (14 +15) = (13+14) + 15

= 13 + 29 = 27 + 15

= 42 = 42

6. 2 × (3×5) = (2×3) × 5

= 2 × 15 = 6 × 5

= 30 = 30

7. -3 × (2×6) = (-3×2) × 6

= -3 × 12 = -6 × 6

= -36 = -36

8. 7 × (-5 × 4) = (7× (-5)) × 4

= 7 × -20 = -35 × 4

= -140 = -140

9. -8 × (-5×4) = (-8×-5) × 4

= -8 × -20 = 40 × 4

= 160 = 160

10. 6 × (10×15) = (6×10) × 15

= 6 × 150 = 60 × 15

= 900 = 900

Penjelasan dengan langkah-langkah:

semoga membantu jangan lupa jadikan jawaban tercedas dan tolong jangan report/hapus jawaban ini:)

#CWIIM