import math a = float(input('Enter coefficient a ')) b = float(input('Enter coefficient b ')) c = float(input('Enter coeeficient c ')) if a == 0: print("a不能为0,不是一元二次方程") else: delta = b ** 2 - 4 * a *c if delta < 0: print("无实数解") elif delta == 0: print("有一个实数解") else: