Завдання 1403 - 1500 » 1498

Обчисли. ((3 3/4 - 4 1/7) ∙ (-3 1/3) ∶ 5/7)/(3/4 ∶ (-0,5625) + 5) = 1/2. 1) 33/4 – 41/7 = –(38/7 – 33/4) = – (32 - 21)/28 = – 11/28 2) – 11/(28 ) · (–31/3) = (11 ∙ 10)/(28 ∙ 3) = 55/42; 3) 55/42 : 5/7 = (55 ∙ 7)/(42 ∙ 5) = 11/6; 4) 3/4 : (–0,5625) = 3/4 : (–5625/10000) = 3/4 : (–9/16) = – (3 ∙ 16)/(4 ∙ 9) = – 4/3 = –11/3; 5) –11/3 + 5 = 32/3; 6) 11/6 : 32/3 = (11 ∙ 3)/(6 ∙ 11) = 1/2.