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题目中未知数、已知数、条件各是什么?题中有没有隐含的条件?如何把问题的各个要素用点、线、角、面等图形来表示?在套用公式前要问自己:以前解过相同的问题吗?能不能从已知数推导出一些中间数据?能不能从未知数回溯出一些中间数据?能不能从中间数据回溯出其他的数据?能不能利用各种思路消除已知数和未知数之间的差异?得出结果后还有没有其他解决问题的想法?能不能将复杂问题转化成相对容易的问题?
Questions in the unknown, the number of known, what is the condition of each? There are no implicit conditions? How to use the elements of the problem point, line, angle, surface and other graphics to represent? Before applying formula to ask yourself: before Can you solve the same problem? Can you deduce some intermediate data from the known ones? Can you trace some intermediate data from unknown data? Can you trace other data from the intermediate data? Can you use all kinds of ideas to eliminate the known data? And the difference between the unknown? After the result is there any other idea to solve the problem? Can complex problems into relatively easy problems?