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函数在中学数学中的主导地位是众所周知 的．它是贯穿整个高中数学的一条主线,又是一 条纽带,把数学的各个分支紧紧地联系在一起． 因此,在每年的高考中函数一直是必考内容,且 所占分值较大．在2004年高考中,福建卷、广东 卷、北京卷、浙江卷、全国卷、湖南卷等都考到了 分段函数问题,所以,我们在关注一些常见函数 (指、对数函数,一、二次函数等)和抽象函数的 同时,也不能忽视这类特殊函数——分段函数．
The dominant position of the function in middle school mathematics is well known. It is a main thread that runs through the mathematics of high school, and it is a link that connects the branches of mathematics tightly together. Therefore, in the college entrance examination every year, the function has always been a must, and it has a higher score. In the 2004 college entrance examination, Fujian section, Guangdong section, Beijing section, Zhejiang section, National section, Hunan section, etc. all have the function of piecewise function. Therefore, we are concerned about some common functions (referring to the logarithmic function, one and two. Subfunctions, etc.) and abstract functions, but also can not ignore this special function - piecewise function.