Вправи 1001 - 1100 » 1041

Обчисліть найзручнішим способом: 1) –4 ∙ 23 ∙ (–0,5) = (–4 ∙ (–0,5)) ∙ 23 = 2 ∙ 23 = 46; 2) –0,4 ∙ (–250) ∙ 5 ∙ (–0,2) = (–0,4 ∙ (–250)) ∙ (5 ∙ (–0,2)) = 100 ∙ (–1) = –100; 3) 7/13 ∙ (–6,5) ∙ 0,4 ∙ (–16/7) = (7/13 ∙ (–13/7)) ∙ (–13/2 ∙ 2/5) = (–1) ∙ (–13/5) = 2,6; 4) 6/23 ∙ (–21/3) ∙ (–69) ∙ 3/7 = 6/23 ∙ (–69) ∙ (3/7 ∙ (–7/3)) = 6 ∙ (–3) ∙ (–1) = 18; 5) –0,7 ∙ 2,5 ∙ 13/7 ∙ (–4) = (–7/10 ∙ 10/7) ∙ 2,5 ∙ (–4) = –1 ∙ (–10) = 10; 6) –5/(18 ) ∙ (–4/13) ∙ 9/25 ∙ (–26) = (–5/18 ∙ 9/25) ∙ ((–4/13) ∙ (–26)) = –0,1 ∙ (–4) ∙ (–2) = –0,8.