题解 | #计算一元二次方程#

from math import sqrt

while 1:
    try:
        a,b,c = map(float,input().split())

        if a != 0:
            delta = b*b - 4*a*c

            if delta == 0:
                root = -b / (2*a) + 0
                print(f'x1=x2={root:.2f}')

            elif delta > 0:
                x1 = (-b - sqrt(delta)) / (2*a)
                x2 = (-b + sqrt(delta)) / (2*a)
                print(f'x1={x1:.2f};x2={x2:.2f}')
            
            else:
                real_part= -b / (2*a)
                imaginary_part = sqrt(-delta) / (2*a)
                print(f'x1={real_part:.2f}-{imaginary_part:.2f}i;x2={real_part:.2f}+{imaginary_part:.2f}i')

        else:
            print('Not quadratic equation')
    except:
        break