Вправи 1201 - 1300 » 1216

Обчисли: 1) 4/7 + 1/7 = (4+1)/7 = 5/7 2) 7/12 + 3/12 = (7+3)/12 = 10/12 3) 5/19 + 11/19 = (5+11)/19 = 16/19 4) 5/11 + 6/11 = (5+6)/11 = 11/11 = 1 5) 7/13 + 9/13 = (7+9)/13 = 16/13 = 1 3/13 6) 4/5 + 4/5 = (4+4)/5 = 8/5 = 1 3/5 7) 7/8 – 1/8 = (7-1)/8 = 6/8 8) 19/37 – 18/37 = (19-18)/37 = 1/37 9) 37/49 – 37/49 = (37-37)/49 = 0/49 = 0 10) 42/55 – 12/55 = (42-12)/55 = 30/55 11) 4/7 – 2/7 = (4-2)/7 = 2/7 12) 39/47 – 22/47 = (39-22)/47 = 17/47