Baiklah untuk soal selanjut nya…
Jawablah soal-soal berikut ini
1. 28(-1/4 + 1/7)
2. (3/4 – 5/6) × 36
3. 17 × 9 + 17 × (-8)
4. 69 × (-7,2) + 31 × (-7,2)
Pembahasan soal
1. 28(-1/4 + 1/7) = 28(-7/28 + 4/28) = 28 × (-3/28) = -3
2. (3/4 – 5/6) × 36 = (9/12 – 10/12) × 36 = (-1/12) × 36 = -3
3. 17 × 9 + 17 × (-8) = 17 (9 – 8) = 17 × 1 = 17
4. 69 × (-7,2) + 31 × (-7,2) = (69 + 31) × (-7,2) = 100 × (-7,2) = -720
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