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dian ji yi ci han shu kao dian
Author(s): 
Pages: 20-22
Year: Issue:  11
Journal: School Journal of Mathematics

Keyword:  一次函数函数关系式二次函数反比例函数中考命题常见题型函数定义取值范围木质地板图象;
Abstract: <正>一次函数是三种常见函数(一次函数、二次函数和反比例函数)中最为简单的函数,因此颇受中考命题者的青睐.下面就有关一次函数的常见题型分类介绍如下.一、考查函数关系式的建立例1已知y-1与(x-1)2成正比例,且当x=-1时,y=3.求当x=3时,y+____.解:把y-1和(x-1)2分别视为一个整体,由正比例函数定义,可设y-1=k(x-1)2(k≠0),即y=k(x-1)2+1.
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