a, b, c = input("nhap a, b, c : "
belta = b * b - 4 * a * c
import math
if belta > 0 :
    x1 = (-b + math.sqrt(belta))/(a * 2)
    x2 = (-b - math.sqrt(belta))/(a * 2)
    print x1
    print x2
else :
    if belta == 0 :
        x = -b/(2 * a)
        print x

    else :
        print "phuong trinh vo nghiem"