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这是一个方程有实根的充要条件的讨论,从探索、简化、质疑、求异四个不同的侧面展示了师生活动的全过程,通过活动纠正了学生的各种错误观念,消除了不必要的怀疑。从中析出了各种不同的解法。
This is a discussion of the necessary and sufficient conditions for an equation to be realistic. The whole process of teacher-student activity is demonstrated from four different aspects: exploring, simplifying, questioning and seeking for differences. The activities correct various mistaken ideas of students and eliminate Unnecessary doubts. From which a variety of different solutions.