一元三次方程计算器

三次方程公式:
判别(Δ) = q³ + r²
q = (3c- b²)/9
r = -27d + b(9c-2b²)
s = r + math.sqrt(判别)
t = r - math.sqrt(判别)
term1 = math.sqrt(3.0)*((-t + s)/2)
r₁₃= 2 * math.sqrt(q)
x₁=(- term1 + r₁₃*math.cos(q³/3) )
x₂=(- term1 + r₁₃*math.cos(q³+(2*math.PI)/3) )
x₃=(- term1 + r₁₃*math.cos(q³+(4*math.PI)/3) )

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