[主持人按对于数学解题来说,最重要的是本真意义与等价性.弄清题目的真正意义;解题时,一步步都要注意保持推演的等价性.这是要核!鉴别一个解法的对与错,也要从问题的本真意义出发;而不能从它的导出意义或某些做法出发.这是常识,也是原则.像本设计中的例子那样,只看是不是“把那 [For the moderator, for mathematics problem solving, the most important thing is true meaning and equivalence. Clear the true meaning of the problem; when solving a problem, step by step, pay attention to keep the equivalence of the deduction. This is to be nuclear. Identifying the right and wrong of a solution must also proceed from the true meaning of the problem; it cannot be based on its derived meaning or certain practices. This is common sense, and it is a principle. Like the example in this design, it only looks like Not "put that