Розділ 6. Звичайні дроби » 1002

Обчисліть: 1) 4 – 12/40 – 21/40 = 4 – (12/40 + 21/40) = 4 – 33/40 = 3 + 40/40 – 33/40 = 3 + 7/40 = 37/40 2) 12 – 13/20 – 7/20 = 12 – (13/20 + 7/20) = 12 – 20/20 = 12 – 1 = 11 3) 5 – (9/22 + 2/22) = 5 – 11/22 = 4 + 22/22 – 11/22 = 411/22 4) 8 – (39/55 – 28/55) = 8 – 11/55 = 7 + 55/55 – 11/55 = 744/55