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用Python实现解一元二次方程，来自廖雪峰Pyhton3.0教程课后习题python # -*- coding: utf-8 -*- import math def quadratic(a, b, c): if (b * b - 4 * a * c) < 0: return 'None' Delte = math.sqrt(b * b - 4 * a * c)

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