Вправи 1201 - 1300 » 1217

Виконай дії: 1) 7/15 + 2/15 = (7+2)/15 = 9/15 2) 9/43 + 11/43 = (9+11)/43 = 20/43 3) 5/13 + 8/13 = (5+8)/13 = 13/43 = 1 4) 8/11 + 5/11 = (8+5)/11 = 13/11 = 1 2/11 5) 9/35 – 1/35 = (9-1)/35 = 8/35 6) 42/47 – 42/47 = (42-42)/47 = 0/47 = 0 7) 5/7 – 4/7 = (5-4)/7 = 1/7 8) 42/111 – 31/111 = (42-31)/111 = 11/111