Вправи 1001 - 1100 » 1023

1023. Розв’яжи рівняння. a) x2 – 3x + 2 = 0; x1 + x2 = 3; x1 • x2 = 2. x1 = 1; x2 = 2. б) x2 – 4x – 5 = 0; x1 + x2 = 4; x1 • x2 = –5. x1 = –1; x2 = 5. в) x2 – 4x + 3 = 0; x1 + x2 = 4; x1 • x2 = 3. x1 = 1; x2 = 3. г) x2 – 7x + 12 = 0; x1 + x2 = 7; x1 • x2 = 12. x1 = 3; x2 = 4.