Завдання 501 - 600 » 516-517

514. Число 42/3 зменш: 1) 42/3 – 21/12 = 2(8 - 1)/12 = 27/12; 2) 42/3 : 2 = 14/3 : 2/1 = (14 ∙ 1)/(3 ∙ 2) = 7/3 = 21/3. 515. Число 71/3: 1) 71/3 + 1/2 = 7(2 + 3)/6 = 75/6; 2) 71/3 – 1/6 = 7(2 - 1)/6 = 71/6; 3) 71/3 · 3 = (22 ∙ 3)/(3 ∙ 1) = 22; 4) 71/3 : 2 = 22/3 : 2/1 = (22 ∙ 1)/(3 ∙ 2) = 11/3 = 32/3.