Завдання 1201 - 1300 » 1201

Обчисли: 1) – 4/9 · 9/5 = – (4 ∙ 9)/(9 ∙ 5) = – 4/5; 2) – 1/5 · (–5/17) = (1 ∙ 5)/(5 ∙ 17) = 1/17; 3) 2/9 · 27/50 = (2 ∙ 27)/(9 ∙ 50) = 3/25; 4) 12 · (–7/36) = – (12 ∙ 7)/36 = – 7/3 = –21/3; 5) –24 · (–5/12) = (24 ∙ 5)/12 = 10/1 = 10; 6) – 21/32 · (–16/35) = (21 ∙ 16)/(32 ∙ 35) = 3/10; 7) 15/22 · (–44/45) = – (15 ∙ 44)/(22 ∙ 45) = – 2/3; 8) – 15/17 · 34/45 = – (15 ∙ 34)/(17 ∙ 45) = – 2/3.