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近几年高考中,型极限成为选择题或填空中的常考题型,因此,这种题型的解法非常重要．现提供几种解这类题的方法．
In the college entrance examination in recent years, the type limit has become a multiple-choice question or a frequently-used question type. Therefore, the solution of this question type is very important. There are several ways to solve such problems.