Question

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Answer 1

1. а) ⅚ + (-7/12) = ⅚ - 7/12 = ¼

б) - 3/10 - 1/15 = - 9 + 2/30 = - 11/30

в) - ⅗ × 5/9 = - ⅓

г) 8/21 ÷ (- 4/7) = - 8/21 × 7/4 = - ⅔

2. 8/15 × (- ½) - 3/10 ÷ (- 6/5) = - 4/15 + 3/10 × ⅚ = - 1/60

3. а) - ⅗ × 7/11 - ⅖ × 7/11 = - 21/55 - 14/55 = - 7/11

б) ¾ × ⅞ - ¾ × ( ⅞ - ⅔) = 21/32 - ¾ × 5/24 = ½