Роздiл 1. Узагальнення в 6 класi » 6

Обчислiть: 1) 1/4 – 1/3 + 2/5 = 15/60 – 20/60 + 24/60 = 19/60; 2) 21/3 – (11/9 + 32/15) = 215/45 – (15/45 + 36/45) = 215/45 – 411/45 = –24/45; 3) (61/7 – 103/14) : (–3/7) + 0,5 = (62/14 – 103/14) : (–3/7) + 1/2 = –41/14 : (–3/7) + 1/2 = –57/14 • (–7/3) + 1/2 = 19/2 + 1/2 = 10; 4) 6,5 • 8/13 + 51/3 : (–22/3) = 61/2 • 8/13 + 16/3 : (–8/3) = 13/2 • 8/13 + 16/3 • (–3/8) = 4 + (–2) = 2.