Download - 找规律
Transcript
![Page 1: 找规律](https://reader036.vdocuments.pub/reader036/viewer/2022062422/56812bc0550346895d900207/html5/thumbnails/1.jpg)
苏教版四年级数学上册
![Page 2: 找规律](https://reader036.vdocuments.pub/reader036/viewer/2022062422/56812bc0550346895d900207/html5/thumbnails/2.jpg)
![Page 3: 找规律](https://reader036.vdocuments.pub/reader036/viewer/2022062422/56812bc0550346895d900207/html5/thumbnails/3.jpg)
![Page 4: 找规律](https://reader036.vdocuments.pub/reader036/viewer/2022062422/56812bc0550346895d900207/html5/thumbnails/4.jpg)
![Page 5: 找规律](https://reader036.vdocuments.pub/reader036/viewer/2022062422/56812bc0550346895d900207/html5/thumbnails/5.jpg)
两端物体是( ),中间物体是( )。两端物体是( ),中间物体是( )。夹子夹子 手帕手帕
![Page 6: 找规律](https://reader036.vdocuments.pub/reader036/viewer/2022062422/56812bc0550346895d900207/html5/thumbnails/6.jpg)
两端物体是( ),中间物体是( )。两端物体是( ),中间物体是( )。木桩木桩 篱笆篱笆
![Page 7: 找规律](https://reader036.vdocuments.pub/reader036/viewer/2022062422/56812bc0550346895d900207/html5/thumbnails/7.jpg)
![Page 8: 找规律](https://reader036.vdocuments.pub/reader036/viewer/2022062422/56812bc0550346895d900207/html5/thumbnails/8.jpg)
验证我们的发现!
那是不是一一间隔排列的两种事物,都存在这样的规律呢?
![Page 9: 找规律](https://reader036.vdocuments.pub/reader036/viewer/2022062422/56812bc0550346895d900207/html5/thumbnails/9.jpg)
小棒和圆片是间隔排列的,并且两端都是小棒,小棒的根数比圆片的个数多 1。
任意拿几根小棒和圆片,在桌子上摆成一排,再在每两根小棒中间摆一个圆。数数小棒的根数和圆的个数,你有什么发现吗?
摆摆看
![Page 10: 找规律](https://reader036.vdocuments.pub/reader036/viewer/2022062422/56812bc0550346895d900207/html5/thumbnails/10.jpg)
每两根小棒中间摆一个圆片组数 小棒个数 圆片的个数
第一组 7第二组
26第三组 8第四组
19
66
2525
99
2020
![Page 11: 找规律](https://reader036.vdocuments.pub/reader036/viewer/2022062422/56812bc0550346895d900207/html5/thumbnails/11.jpg)
马路一边有 25根电线杆,每两根电线杆中间有一个广告牌。一共有多少个广告牌?
25-1=24(个 )
两端物体中间物体
两端物体
如果有 25个广告牌,那又会有多少根电线杆呢 ?25+1=26(个)
![Page 12: 找规律](https://reader036.vdocuments.pub/reader036/viewer/2022062422/56812bc0550346895d900207/html5/thumbnails/12.jpg)
![Page 13: 找规律](https://reader036.vdocuments.pub/reader036/viewer/2022062422/56812bc0550346895d900207/html5/thumbnails/13.jpg)
2(1) 把一根木料锯 3次,能锯成多少段?
(2) 如果锯成 6段,需要锯几次?3+1=4(段 )
6-1=5(次 )
![Page 14: 找规律](https://reader036.vdocuments.pub/reader036/viewer/2022062422/56812bc0550346895d900207/html5/thumbnails/14.jpg)
想一想:
你还能找到有这样规律的事情吗?小组内互相说一说。
![Page 15: 找规律](https://reader036.vdocuments.pub/reader036/viewer/2022062422/56812bc0550346895d900207/html5/thumbnails/15.jpg)
欣赏:生活中的一一间隔
![Page 16: 找规律](https://reader036.vdocuments.pub/reader036/viewer/2022062422/56812bc0550346895d900207/html5/thumbnails/16.jpg)
![Page 17: 找规律](https://reader036.vdocuments.pub/reader036/viewer/2022062422/56812bc0550346895d900207/html5/thumbnails/17.jpg)
![Page 18: 找规律](https://reader036.vdocuments.pub/reader036/viewer/2022062422/56812bc0550346895d900207/html5/thumbnails/18.jpg)
75-1=7475-1=74(棵)(棵)
![Page 19: 找规律](https://reader036.vdocuments.pub/reader036/viewer/2022062422/56812bc0550346895d900207/html5/thumbnails/19.jpg)
![Page 20: 找规律](https://reader036.vdocuments.pub/reader036/viewer/2022062422/56812bc0550346895d900207/html5/thumbnails/20.jpg)