Завдання 1402 - 1500 » 1432

Розв’яжіть рівняння: 1) 9х – 16 = 2; 9х = 2 + 16; 9х = 18; х = 18 : 9; х = 2. 2) 4 – 2у = 24; –2у = 24 – 4; –2у = 20; у = 20 : (–2); у = –10. 3) 6х = 32 – 2х; 6х + 2х = 32; 8х = 32; х = 32 : 8; х = 4. 4) –2у = 4у + 24; –2у – 4у = 24; у = 24 : (–6); у = –4. 5) 3х – 8 = х; 3х – х = 8; 2х = 8; х = 8 : 2; х = 4. 6) –20 = 4у + 8; 4у = –20 –8; 4у = –28; у = –28 : 4; у = –7. 7) 5х + 4 = 3х – 12; 5х – 3х = –12 – 4; 2х = –16; х = –16 : 2; х = –8. 8) –у + 25 = 12у – 1; –у – 12у = –1 – 25; –13у = –26; у = –26 : (–13); у = 2. 9) 10 = 4z – 2 – 2z; 2z = 10 + 2; 2z = 12; z = 12 : 2; z = 6. 10) –2 = 3x + 14 + x; 4x = –2 –14; 4x = –16; x = –16 : 4; x = –4; 11) 10y + 6 = 12y – 8; 10y – 12y = –8 – 6; –2y = –14; y = –14 : (–2); y = 7; 12) 11z –3 = –3 –1; 11z = –4 + 3; 11z = –1; z = –1/11.