5х квадрате-7х+2=0; 2х квадрате-7х+3=0; 3х квадрате+2х-5=0; 2х квадрате-5х+3=0; х квадрате+ 3х+1=0

1. 5x^2 - 7x + 2 = 0.а) ищем D = 49 - 4 * 5 * 2 = 49 - 40 = 9b) x1 = (7 + 3) / 10 = 1x2 = (7 - 3) / 10 = 2/52. 2x^2 - 7x + 3 = 0.а) ищем D = 49 - 4 * 2 * 3 = 49 - 24 = 25b) x1 = (7 + 5) / 4 = 3x2 = (7 - 5) / 4 = 1/23. 3x^2 + 2x - 5 = 0.а) ищем D = 4 - 4 * 3 * (-5) = 4 + 60 = 64b) x1 = (-2 - 8) / 6 = -5/3x2 = (-2 + 8) / 6 = 14. 2x^2 - 5x + 3 = 0.а) ищем D = 25 - 4 * 2 * 3 = 25 - 24 = 1b) x1 = (5 + 1) / 4 = 3/2x2 = (5 - 1) / 4 = 15. x^2 + 3x + 1 = 0.а) ищем D = 9 - 4 * 1 * 1 = 5b) x1 = (-3 + √5) / 2x2 = (-3 - √5) / 2