Завдання 401 - 500 » 478

Знайдіть значення виразу: 1) 13/7 ∙ 3/20 – 4/21 = 10/7 ∙ 3/20 – 4/21 = 3/14 – 4/21 = 9/42 – 8/42 = 1/42; 2) 24/9 ∙ 6/11 – 25/27 = 22/9 ∙ 6/11 – 25/27 = 4/3 – 25/27 = 36/27 – 25/27 = 11/27; 3) 35/6 + 24/5 ∙ 25/42 = 35/6 + 14/5 ∙ 25/42 = 35/6 + 5/3 = 35/6 + 14/6 = 49/6 = 51/2. 4) 32/3 ∙ 21/44 + 21/6 = 11/3 ∙ 21/44 + 13/6 = 7/4 + 13/6 = 21/12 + 26/12 = 47/12 = 311/12.