1 / 6

不等式和它的基本性质

不等式和它的基本性质. 第 2 课时. 不等式基本性质 1 不等式两边都加上(或减去)同一个或同一个整式,不等号的方向不变。 不等式基本性质 2 不等式两边都乘(或除以)同一个正数,不等号的方向不变。 不等式基本性质 3 不等式两边都乘(或除以)同一个负数,不等号的方向改变。. 例 2 根据不等式的基本性质,把下列不等式化成 x <a 或 x>a 的形式 (1)x-2<3 (2)6x<5x-1 (3)x>5 (3)-4x>3.

gilda
Download Presentation

不等式和它的基本性质

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. 不等式和它的基本性质 第2课时

  2. 不等式基本性质1 不等式两边都加上(或减去)同一个或同一个整式,不等号的方向不变。 不等式基本性质2 不等式两边都乘(或除以)同一个正数,不等号的方向不变。 不等式基本性质3 不等式两边都乘(或除以)同一个负数,不等号的方向改变。

  3. 例2 根据不等式的基本性质,把下列不等式化成x<a或x>a的形式 (1)x-2<3 (2)6x<5x-1 (3)x>5 (3)-4x>3

  4. 例3 设a<b,用“<”或“>”号填空 (1)a-3 _ b-3 (2) –4a _ -4b (3)a+5 _ b+5 (4)3a _3b

  5. 练习: 1、填空 (1)当a>0,b_0时,ab>0; (2)当a>0,b_0时,ab<0; (3)当a<0,b_0时,ab>0; (4)当a<0,b_0时,ab<0;

  6. 2、填空: 如果a-b<0,那么a_b; 如果a-b=0,那么a_b; 如果a-b>0,那么a_b;

More Related