Частина 2 — Вправи: 1041

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) 713 ∙ (–6,5) ∙ 0,4 ∙ (–167) = (713 ∙ (–137)) ∙ (–132 ∙ 25) = (–1) ∙ (–135) = 2,6;

4) 623 ∙ (–213) ∙ (–69) ∙ 37 = 623 ∙ (–69) ∙ (37 ∙ (–73)) = 6 ∙ (–3) ∙ (–1) = 18;

5) –0,7 ∙ 2,5 ∙ 137 ∙ (–4) = (–710 ∙ 107) ∙ 2,5 ∙ (–4) = –1 ∙ (–10) = 10;

6) –518 ∙ (–413) ∙ 925 ∙ (–26) = (–518 ∙ 925) ∙ ((–413) ∙ (–26)) = –0,1 ∙ (–4) ∙ (–2) = –0,8.