Завдання 301 - 400 » 374

Знайди значення виразу: 1) 25/9 · 21/4 – 62/9 · 3/8 = (23 · 9)/(9 ∙ 4) – (56 ∙ 3)/(9 ∙ 8) = 23/4 – 7/3 = 53/4 – 21/3 = 3(9 - 4)/12 = 35/12; 2) (62/5 · 211/12 – 16) · 21/4 = ((32 ∙ 35)/(5 ∙ 12) – 16) · 21/4 = (56/3 – 16) · 21/4 = (8 ∙ 9)/(3 ∙ 4) = 6; 3) (1/2)3 · (31/3 – 28/9)2 = (11 ∙ 1)/(2 ∙ 2 ∙ 2) · (24/3 – 28/9)2 = 1/8 · ((12 - 8)/9)2 = (1 ∙ 4 ∙ 4)/(8 ∙ 9 ∙ 9) = 2/81.