Завдання 1301 - 1401 » 1322

Обчисліть: 1) –24 ∙ (5/12 – 3/4 + 1/2 – 1/6 – 2/3) = –24 ∙ (5/12 – 9/12 + 6/12 – 2/12 – 8/12) = –24 ∙ (–8/12) = 16; 2) (1/10 – (–1/7) + 1/5 – 1/3) ∙ 210 = (21/210 + 30/210 + 42/210 – 70/210) ∙ 210 = 23/210 ∙ 210 = 23; 3) 153 ∙ (–1/9 + 1/17 – 2/51) – 18 ∙ (4/9 – 1/6 + 8/18) = 153 ∙ (–17/153 + 9/153 – 6/153) – 18 ∙ (8/18 – 3/18 + 8/18) = 153 ∙ (–14/153) – 18 ∙ 13/18 = –14 – 13 = –27.