Завдання 1201 - 1300 » 1274

Обчисли найзручнішим способом: 1) 16 · (–13/8 + 21/16 – 31/2) = 16 · (–11/8) + 16 · 7/2 = –22 + 33 – 56 = – 45; 2) (–5/12 + 3/7 + 1) · (–8,4) = (5 ∙ 84)/(12 ∙ 10) – (3 ∙84)/(7 ∙10) – 1 · 8,4 = 3,5 – 3,6 – 8,4 = –8,5; 3) –6 · 21/3 + 31/2 · (–6) = –6 · (21/3 + 31/2) = –6 · 55/6 = – (6 ∙ 35)/6 = –35; 4) 11 · (–31/7) + 21/7 · 11 + 11 = 11 · (–31/7 + 21/7 + 1) = 11 · 0 = 0.