Завдання 1201 - 1300 » 1207

Знайди добуток: 1) – 12/13 · 15/8 = – (12 ∙ 13)/(13 ∙ 8) = – 3/2 = –11/2; 2) –51/4 · (–21/3) = (21 ∙ 7)/(4 ∙ 3) = 49/4 = 121/4; 3) –15/7 · (–61/8) = (12 ∙ 49)/(7 ∙ 8) = 21/2 = 101/2; 4) 33/5 · (–27/9) = – (18 ∙ 25)/(5 ∙ 9) = – 10/1 = –10.