在教学中经常出现:面对难度较大的题目,学生手足无措,以致“举白旗”投降.长叹数学之难难于上青天!有时候,我们也会发现,有的学生能够解出一些难题,但问他方法,则含糊其辞,难以说出所以然.教师自己有时也是如此,看着题目的解答,心里往往会生出这样的疑惑:这个答案到底是怎么来的?这种情况说明教师需要花更多时间和精力研究问题.不仅要解出问题,还要思考如何把这样的问题阐述得能够让学生接受,并从中体会出数学的思想和 Often appear in the teaching: In the face of the more difficult subject, the students are at a loss what to do, so that they can surrender the “white flag.” Sometimes, we can find that some students can solve some difficult problems , But asked him the method, then vague, hard to say why ... The teacher himself is sometimes the case, looking at the answer to the question, the heart often give birth to such doubts: how does this answer come from? This situation shows that teachers need Spend more time and energy to study the problem.Not only to solve the problem, but also to think about how to explain such problems to enable students to accept and learn from the mathematical thinking and