Відповіді до вправ 51 - 100

61. Виконайте дії:

1) –6/7 + (–4/21) = –18/21 + (–4/21) =

= –22/21 = –11/21;

2) –47/12 + 51/6 = –47/12 + 52/12 =

= –47/12 + 414/12 = 7/12;

3) 12/41 – 1 = 12/41 – 41/41 = –29/41;

4) 21/3 – (–52/9) = 23/9 + 52/9 = 75/9;

5) –8/9 • 27/48 = –3/6 = –1/2;

6) –12/7 • (–21/3) = 9/7 • 7/3 = 3;

7) 8/15 : (–11/5) = 8/15 : (–6/5) = 8/15 • (–5/6) = –4/9;

8) –30/41 : (–5) = –30/41 • (–1/5) = 6/41;

9) (–2/7)² = (–2/7) • (–2/7) = 4/49.