7-4错在哪？
import math
def quadratic_equation(a, b, c):
x1=(-b-math.sqrt(b*b-4*a*c))/2*a
x2=(-b+math.sqrt(b*b-4*a*c))/2*a
return x1,x2
print quadratic_equation(2, 3, 0)
print quadratic_equation(1, -6, 5)
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import math
def quadratic_equation(a, b, c):
x1=(-b-math.sqrt(b*b-4*a*c))/2*a
x2=(-b+math.sqrt(b*b-4*a*c))/2*a
return x1,x2
print quadratic_equation(2, 3, 0)
print quadratic_equation(1, -6, 5)
2019-01-06
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