§ 5. Звичайні дроби » 1023

Обчисліть: 1) 19/30 – (11/30 – 7/30) = 19/30 – 4/30 = 15/30 2) 7/24 + 17/24 – 1/3 = 24/24 – 1/3 = 1 – 1/3 = 3/3 – 1/3 = 2/3 3) 24/15 – 9/15 – 2/17 = 15/15 – 2/17 = 1 – 2/17 = 17/17 – 2/17 = 15/17