def quadratic(a, b, c): x1 = (-b + math.sqrt(b ** 2 - 4 * a * c)) / (2 * a) x2 = (-b - math.sqrt(b ** 2 - 4 * a * c)) / (2 * a) return x1, x2print('quadratic(2, 3, 1) =', quadratic(2, 3, 1))print('quadratic(1, 3, -4) =', quadratic(1, 3, -4))if quadratic(2, 3, 1) != (-0.5, -1.0): print('测试失败')elif quadratic(1, 3, -4) != (1.0, -4.0): print('测试失败')else: print('测试成功')
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