Завдання 1402 - 1500 » 1441 (3-6)

3) 1/2(х – 4) + 6х = 5 – 11/2х; 0,5х – 2 + 6х = 5 – 1,5х; 6,5х + 1,5х = 5 + 2; 8х = 7; х = 7/8. 4) 3,2 (1 – 2у) = 0,7(3у – 1,5); 3,2 – 6,4у = 2,1у – 1,05; –6,4у – 2,1у = –1,05 – 3,2; –8,5у = –4,25; у = 0,5. 5) 5/12 (z – 3) = 1/6(2z – 7) + 2; 5/12z – 5/4 = 1/3z – 7/6 + 2; 5/12z – 1/3z = – 7/6 + 2 + 5/4; 5/12z – 4/12z = – 14/12 + 24/12 + 15/12; 1/12z = 25/12; z = 25. 6) 5/8(x – 2) = 2/3(x + 2) – (3 –x); 5/8x – 5/4 = 2/3x + 4/3 – 3 + x; 5/8x – 5/3x = 5/4 + 4/3 – 3; 15/24x – 40/24x = 15/12 + 16/12 – 36/12; –25/24x = –5/12; 25x = 10; x = 0,4.