Завдання 1402 - 1500 » 1442 (3-4)

3) 4 – 4,5y = 2y – 2/3(8y – 10); 4 – 9/2y = 2y – 16/3y + 20/3; – 9/2y – 2y + 16/3y + 20/3; – 27/6y – 12/6u + 32/6y = 8/3; – 7/6y = 8/3; y = – 8/3 ∙ 6/7; y = – 16/7 = –22/7. 4) 3 – 1/3 ∙ (2/3y + 1/2) = 1/3y + 1,5; 3 – 2/9y – 1/6 = 1/3y + 3/2; – 2/9y – 1/3y = 3/2 – 3 + 1/6; – 2/9y – 3/9y = 9/6 – 18/6 + 1/6; – 5/9y = – 8/6; y = 8/6 ∙ 9/5; y = 12/5 = 22/5.