Вправи 1001 - 1100 » 1013

Виконайте дії: 1) (–13/25) ∙ 21/7 + (–21/9) ∙ (–27/190) = (–28/25) ∙ 15/7 + (–19/9) ∙ (–27/190) = – 12/5 + 3/10 = –24/10 + 3/10 = –21/10; 2) (8 + 21/7 ∙ (–31/9)) ∙ (–27/44) = (8 + 15/7 ∙ (–28/9)) ∙ (–27/44) = (8 – 20/3) ∙ (–27/44) = (8 + 21/7 ∙ (–31/9)) ∙ (–27/44) = 4/3 ∙ (–27/44) = – 9/11; 3) (–51/16 + 11/8) ∙ (–5/6 – 3/14) = (–417/16 + 12/16) ∙ (–35/42 + (–9/42)) = –315/16 ∙ (–44/42) = – 63/16 ∙ (–44/42) = 33/8 = 41/8. 4) (6,75 + (–4,5) ∙ 12/3) ∙ (–11/3)3 = (63/4 + (–9/2) ∙ 5/3) ∙ (–4/3)3 = (63/4 – 71/2) ∙ (–64/27) = (63/4 – 66/4) ∙ (–64/27) = 3/4 ∙ 64/27 = 16/9 = 17/9.