ЧАСТИНА 1. Узагальнення за 5-6 класи » 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.