Завдання 1403 - 1500 » 1481

Обчисли: 1) – 1/2 : 10 + 87/10 : 5 + (–41/5) · (–0,4) = – 1/20 + 137/50 + (–4,2) · (–0,4) = –0,05 + 1,74 + 1,68 = 3,37; 2) – 21/22 · (10 – 145/7) + 48 : (810/17 – 10) = – 21/22 · (–45/7) + 48 : (–17/17) = = (21 ∙ 33)/(22 ∙ 7) – (48 ∙ 17)/(1 ∙ 24) = 9/2 – 34 = 4,5 – 34 = –29,5.