作出下列对数函数图像的图像(1)y=x-1,x...

来源：蜘蛛抓取(WebSpider) 时间：2011-10-05 15:47 标签： 对数函数图像
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＞＞＞作出函数f(x)=|x-2|-|x+1|的图象，并由图象求f(x)的值域．-高一数..
作出函数f(x)=|x-2|-|x+1|的图象，并由图象求f(x)的值域．
题型：解答题难度：中档来源：同步题
解：当x＜-1时，f(x)=-（x-2）-[-（x+1）]=3；当-1≤x≤2时， f(x)=-（x-2）-（x+1）=-2x+1；当x＞2时，f(x)=（x-2）-（x+1）=-3，∴f(x)=，f(x)的图象如下图所示，由函数图象知，函数的值域为[-3，3]。
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据魔方格专家权威分析，试题“作出函数f(x)=|x-2|-|x+1|的图象，并由图象求f(x)的值域．-高一数..”主要考查你对&&分段函数与抽象函数&&等考点的理解。关于这些考点的“档案”如下：
现在没空？点击收藏，以后再看。
因为篇幅有限，只列出部分考点，详细请访问。
分段函数与抽象函数
分段函数：1、分段函数：定义域中各段的x与y的对应法则不同，函数式是分两段或几段给出的； 分段函数是一个函数，定义域、值域都是各段的并集。&抽象函数：
我们把没有给出具体解析式的函数称为抽象函数； 一般形式为y=f（x），或许还附有定义域、值域等，如：y=f（x），（x＞0，y＞0）。 知识点拨：
1、绝对值函数去掉绝对符号后就是分段函数。 2、分段函数中的问题一般是求解析式、反函数、值域或最值，讨论奇偶性单调性等。 3、分段函数的处理方法：分段函数分段研究。
发现相似题
与“作出函数f(x)=|x-2|-|x+1|的图象，并由图象求f(x)的值域．-高一数..”考查相似的试题有：
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