Завдання 1301 - 1402 » 1378

Розв’яжи рівняння: 1) 1/3x – 2 = 5 – 2/3x; 1/3 x + 2/3x = 5 + 2; x = 7. 2) 14/5x + 2 = 4/5x – 8; 14/5x – 4/5x = –8 – 2; x = –10. 3) 11/7x – 5 = 6/7x + 9; 11/7x + 6/7x = 9 + 5; 2x = 14; x = 14 : 2; x = 7. 4) 5/9x + 2 = 4/9x; 5/9 x – 4/9x = –2; 1/9 x = –2; x = –2 : 1/9; x = –18. 5) –31/8x + 3 = – 1/8x – 6; –31/8x + 1/8x = –6 – 3; –3x = –9; x = –9 : (–3); x = 3. 6) 51/4x – 12 = 8 – 43/4x; 51/4x + 43/4x = 8 + 12; 10x = 20; x = 20 : 10; x = 2.