1 / 12

490

490. 939. 400. 1000. 900. 500. 求近似数. www,378700000.com. 为什么要用近似数?. 不需要用准确数,只需要大致范围,用近似数更方便. 近似数  准确数. www,378700000.com. 尾数. 1<5 ,就把 万位后面的数舍去 ,全改 写成 0 。. 11030 大约是几万?. 1 1 030. 0000. 11330 ? 11430 ? 11930 ? 11999 ?. A. B. 10030 12030 13030 14030. www,378700000.com.

Download Presentation

490

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. 490 939 400 1000 900 500

  2. 求近似数

  3. www,378700000.com 为什么要用近似数? 不需要用准确数,只需要大致范围,用近似数更方便 近似数准确数

  4. www,378700000.com 尾数 1<5,就把万位后面的数舍去,全改 写成0。 11030大约是几万? 11030 0000 11330? 11430? 11930? 11999? A B 10030 12030 13030 14030

  5. www,378700000.com 6>5,向前一位进1,再把它和后面的数舍去,全都改写成0 15030 17030 18030 19030 16030大约是多少万? 16030

  6. www,378700000.com 不满5(0、1、2、3、4),就把尾数省略变成0 满5(5、6、7、8、9),就向前一位进一 尾数的最高位 四舍五入法 先分级

  7. 省略万后面的尾数求下列数的近似数 (验算本) 234108 195820

  8. 想一想 怎样确定是“舍”还是“入”呢?

  9. 省略下面各数万位后面的尾数求近似数 (课堂本) (1) 33087 (2)473986 (3)59180 看千位 省略万位后面的尾数:

  10. www,378700000.com TITLE 1 7 8 6 8 0 0 0 0

  11. www,378700000.com 省略下面各数亿位后面的尾数求近似数(课堂本) (1)8 7006 0000 (2)20 4800 0000 (3)9 8000 0000 省略亿位后面的位数: 看千万位

More Related