import mathdef quadratic(x, y, z):    d = b**2 - 4*a*c    if d > 0:        x1 = (-b + math.sqrt(d)) / (2*a)        x2 = (-b - math.sqrt(d)) / (2*a)        print('方程有两个不同的实数根:\nx1={0},x2={1}'.format(x1, x2))    if d == 0:        x1 = (-b + math.sqrt(d)) / (2*a)        x2 = (-b - math.sqrt(d)) / (2*a)        print('方程有两个相同的实数根:\nx1={0},x2={1}'.format(x1, x2))    if d < 0:        print('方程没有实数根')a, b, c = map(int, input("a,b,c=").split(","))quadratic(a, b, c)