Завдання 201 - 300 » 257

Виконай дії: 1) 1 – (4/35 + 1/28) = 1 – (16 + 5)/140 = 1 – 21/140 = 1 – 3/20 = 20/20 – 3/20 = 17/20; 2) 4 – (2/7 – 5/42) = 4 – (12 - 5)/42 = 4 – 7/42 = 4 – 1/6 = 36/6 – 1/6 = 35/6; 3) 7 – (4/5 – 3/10) = 7 – (8 - 3)/10 = 7 – 5/10 = 7 – 1/2 = 62/2 – 1/2 = 61/2.