python求解一元二次方程
importmathdefquadratic(a,b,c):delta=math.pow(b,2)-4*a*cifa==0:x1=-b/cx2=-b/celifdelta...
import math
def quadratic(a,b,c):
delta = math.pow(b,2)-4*a*c
if a == 0:
x1 = - b / c
x2 = - b / c
elif delta < 0:
raise TypeError('no instance solution')
else:
x1 = (-b + math.sqrt(delta))/2*a
x2 = (-b - math.sqrt(delta))/2*a
return x1,x2
#test
q1 = quadratic(2,3,1)
print(q1)
输出的(-2,-4),正确的应该是(-0.5,-1) 展开
def quadratic(a,b,c):
delta = math.pow(b,2)-4*a*c
if a == 0:
x1 = - b / c
x2 = - b / c
elif delta < 0:
raise TypeError('no instance solution')
else:
x1 = (-b + math.sqrt(delta))/2*a
x2 = (-b - math.sqrt(delta))/2*a
return x1,x2
#test
q1 = quadratic(2,3,1)
print(q1)
输出的(-2,-4),正确的应该是(-0.5,-1) 展开
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