Завдання 501 - 600 » 542

Обчисли: 1. 21/2 : 13/4 · (4,2 – 3,5) · (4/7)2 = 16/49. 1) 4,2 – 3,5 = 0,7; 2) (4/7)2 = (4 ∙ 4)/(7 ∙ 7) = 16/49; 3) 21/2 : 13/4 = 5/2 : 7/4 = (5 ∙ 4)/(2 ∙ 7) = 10/7; 4) 10/7 · 7/10 · 16/49 = 16/49. 2. (11/2)2 : (142/5 – 41/2) · 15,4 = 3,5. 1) 142/5 – 41/2 = 137/5 – 41/2 = 9(14 - 5)/10 = 99/10; 2) (11/2)2 = (3/2)2 = (3 ∙ 3)/(2 ∙ 2) = 9/4; 3) 9/4 : 99/10 = 9/4 : 99/10 = (9 ∙ 10)/(4 ∙ 99) = 5/22; 4) 5/22 · 15,4 = (5 ∙ 15,4)/22 = 3,5.