import math

# 定义一个函数，接受三个参数，返回一个一元二次方程的两个解
def quadratic(a,b,c):
    m=b*b-4*a*c
    if m>=0:
        x=(-b+math.sqrt(m))/(2*a)
        y=(-b-math.sqrt(m))/(2*a)
        return x,y
    else:
        return 'no answer!'
print(quadratic(2,3,1))
# 快速复制到下一行，CTR+D、
print(quadratic(1,3,1))
print(quadratic(1,4,4))
print(quadratic(1,-4,4))