2x² - 1999 x + 1997 = 0
а = 2; b = -1999; c = 1997
D = b² - 4ac = (-1999)² - 4 * 2 * 1997 = 3996001 - 15976 = 3980025
x1 = - b + √D
= - ( -
1999) + √3980025 = 1999 + 1995 = 998,5
2a 2 * 2 4
x2 = - b - √D
= - ( - 1999) - √3980025 = 1999 - 1995 = 1
2a 2 * 2 4
Ответ: 1; 998,5