The special role of counterexamples in mathematics theory is discussed. Several special examples used in teaching differential of multi-function are given.
讨论了反例在数学理论中的特殊作用，并给出了几个在多元函数微分学教学中应用的特例。
There are some examples in solving mathematics problems in this article. And it offers some teaching countermeasures to strengthen return thought.
在此介绍了化归思想在数学解题中的几个应用，并提出了加强化归思维的教学对策。
There are some examples in solving mathematics problems in this article. And it offers some teaching countermeasures to strengthen return thought.
在此介绍了化归思想在数学解题中的几个应用，并提出了加强化归思维的教学对策。
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