求翻译：函数的极值也是函数研究中的一个重要问题,对于连续函数的极值问题,已有各种求极值的方法,但对函数在间断点处是否取得极值一般教材均较少涉及。事实上,驻点和导数不存在的点是连续函数可能的极值点,而函数的极值点也可能是间断点,而间断点又分为第一类间断点和第二类间断点。在指定间断点处有定义的第一类间断点,可以分为以下两种情况:(1)在指定间断点处的左、右极限都存在,且都不等于该点处的函数值；(2)在指定间断点处的左、右极限都存在但不相等,且其中一个极限等于该点处的函数值。由函数极限的定义,我们来讨论如何判定函数在有定义的第一类间断点处的极值。是什么意思？

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The function value is a function in the study, an important issue for continuous function, the value of a variety of great value for the method, but the interruption of the function at the point values are very general materials are less involved. In fact, the points and derivative does not exist is

The function extreme value also is in a function research important question, regarding the continuous function minimum problem, had each kind to ask the extreme value the method, but to function in point of discontinuity place whether obtains the extreme value common teaching material little to inv

Study on extremum of the function is a function of an important issue, for a continuous function's extremum, has had a variety of method to extremes, but on the extreme value of function at a break point whether materials are less involved in General. In fact, the resident and is a continuous functi

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