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极限思想是高考考查的数学思想之一,运用极限思想,往往会使求解过程变得简捷,下面举例说明极限思想在解题中的妙用．
The limit thought is one of the mathematical ideas of college entrance examination and examination. The use of limit thinking tends to make the process of solving simple and straightforward. The following illustrates an example of the magical effect of limit thinking in solving problems.