Завдання 1201 - 1300 » 1246

Обчисли: 1) –6,3 · 1/7 · (–1/12) · 8,4 = (63 ∙ 1)/(10 ∙ 7) · (1 ∙ 84)/(12 ∙ 10) = 9/10 · 7/10 = 63/100 = 0,63; 2) –113/15 · (–0,625) · (–52/5) = – (28 ∙ 5 ∙ 27)/(15 ∙ 8 ∙ 5) = – 63/10 = –6,3; 3) 2,5 · (–4,2) · 31/3 · 8/35 = 21/2 · (–41/5) · 31/3 · 8/35 = – (5 ∙ 21 ∙ 10 ∙ 8)/(2 ∙ 5 ∙ 3 ∙ 35) = –8; 4) –1,8 · (–12/3) · (–21/7) · (–42/3) = (–14/5) · (–12/3) · (–21/7) · (–42/3) = (9 ∙ 5 ∙ 15 ∙ 14)/(5 ∙ 3 ∙ 7 ∙ 3) = 30.