Hitunglah. 1. -2 × 9 × (-5) 2. 3 : (-6) × 8 3. 9 + 2 × (-3)
Hitunglah.
1. -2 × 9 × (-5)
2. 3 : (-6) × 8
3. 9 + 2 × (-3)
4. -2 × (5 – 9)
5. (-6) × 2 – 21 : (-7)
6. 36 : (-3)2
7. (1/4 – 2/3) × 12
8. 5/6 – ½ : (-3)
Pembahasan:
1. -2 × 9 × (-5) = 2 × 9 × 5 = 90
2. 3 : (-6) × 8 = -(3 × 1/6 × 8) = -4
3. 9 + 2 × (-3) = 9 – 6 = 3
4. -2 × (5 – 9) = -2 × (-4) = 8
5. (-6) × 2 – 21 : (-7) = -12 + 3 = -9
6. 36 : (-32) = 36 : (-9) = -4
7. (1/4 – 2/3) × 12 = ¼ × 12 – 2/3 × 12 = 3 – 8 = -5
8. 5/6 – ½ : (-3) = 5/6 + 1/2 × 1/3 = 5/6 + 1/6 = 6/6 = 1
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