Hitunglah. 1. 4 + 7 × (6 – 7) 2. 10 – (-8 + 5) × 6 3. (6 – 23) × (-3)
Hitunglah.
1. 4 + 7 × (6 – 7)
2. 10 – (-8 + 5) × 6
3. (6 – 23) × (-3)
4. (-4)2 + 25 : (-52)
5. 1/3 + (-2/3)2
6. 1/4 – 3/7 : 4/7
Pembahasan:
1. 4 + 7 × (6 – 7) = 4 + 7 × (-1) = 4 – 7 = -3
2. 10 – (-8 + 5) × 6 = 10 – (-3) × 6 = 10 + 18 = 28
3. (6 – 23) × (-3) = (6 – 8) × (-3) = (-2) × (-3) = 6
4. (-4)2 + 25 : (-52) = 16 + 25 : 25 = 16 + 1 = 17
5. 1/3 + (-2/3)2 = 1/3 + 4/9 = 3/9 + 4/9 = 7/9
6. 1/4 – 3/7 : 4/7 = 1/4 – 3/7 × 7/4 = 1/4 – 3/4 = -2/4 = - ½
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