ЧАСТИНА 1. Узагальнення за 5-6 класи » 62

Виконайте дії: 1) –5/9 + (–7/12) = –20/36 + (–21/36) = –41/36 = –15/36; 2) 51/4 + (–71/8) = 52/8 + (–69/8) = –17/8; 3) –8/17 – 1 = –18/17; 4) 21/3 – (–52/9) = 23/9 + 52/9 = 75/9; 5) –7/9 • (–18/49) = 2/7; 6) 41/2 • (–17/9) = 9/2 • (–16/9) = –8; 7) –33/5 : (–9/10) = –18/5 • (–10/9) = 4; 8) –8 : 16/17 = –8 • 17/16 = –17/2 = –81/2; 9) (–3/5)2 = (–3/5) • (–3/5) = 9/25.