class Math:
    def __init__(self, a, b, c):
        self.a = a
        self.b = b
        self.c = c

    def solve_quadratic(self):
        discriminant = self.b**2 - 4*self.a*self.c
        if discriminant > 0:
            root1 = (-self.b + math.sqrt(discriminant)) / (2*self.a)
            root2 = (-self.b - math.sqrt(discriminant)) / (2*self.a)
            return root1, root2
        elif discriminant == 0:
            root = -self.b / (2*self.a)
            return root
        else:
            root = -math.sqrt(-discriminant) / (2*self.a)
            return root

# 示例
a = 1
b = -3
c = 2
m = Math(a, b, c)
root1, root2 = m.solve_quadratic()
print("根1：", root1)
print("根2：", root2)