1、小明家住在三楼他从一楼走到三楼需要走几层楼梯?若每层楼梯有16个台阶,则共有多少个台阶?小亚为小朋友准备了一些礼物，要剪绳子来包装礼物，在剪绳子的时候，她发现一些有趣的问题，我们一起来看看好吗？探究一探究一一根绳子剪一次，分成几段，剪两次呢?剪三次呢？分成二段分成三段分成四段探究一探究一 探究二探究二 探究三探究三 探究四探究四 那么剪的次数与剪得的绳子的段数究竟有什么关系呢？下面请学生实际操作剪长纸条，并将剪得的结果填入下表中。探究一探究一通过以上表格的填写，你发现了什么规律？56789100 101段数=次数+1探究一探究一 探究二探究二 探究三探究三 探究四探究四探究二探究二 同学们在道
2、路的一侧，从一个端点开始到另一个端点为止种树，两个端点都种树，树的棵树与间隔的段数又有什么关系呢？探究一探究一 探究二探究二 探究三探究三 探究四探究四请你仔细观察并把观察的结果填入下表。探究二探究二 通过以上表格的填写你发现了什么规律?1234567 98 99探究一探究一 探究二探究二 探究三探究三 探究四探究四两端都种树时棵数=段数+1段数=棵数-1探究二探究二(练习练习)在50米长的马路一边种树，每10米种一棵，若两端都种，要种几棵树?5010+1=6(棵)答:要种6棵。10203040500探究一探究一 探究二探究二 探究三探究三 探究四探究四探究三探究三请你仔细观察并把观察的结果填
3、入下表。通过以上表格的填写你发现了什么规律?棵数=段数一端种一端不种时2345678 99 100探究一探究一 探究二探究二 探究三探究三 探究四探究四探究三探究三(练习练习)小明在桌上每隔5厘米处放一朵花,当他放到20厘米时,共可放几朵花?05101520 205=4(朵)答:共可放4朵花.探究一探究一 探究二探究二 探究三探究三 探究四探究四探究四探究四仔细观察,并将观察的结果填入下表3456789 100 101 通过以上表格的填写你发现了什么规律?棵数=段数-1两端都不种时段数=棵数+1探究一探究一 探究二探究二 探究三探究三 探究四探究四探究四探究四(练习练习)在60米长的马路一边等
4、距离的安装了5盏灯，若规定两端都不安装,则两盏灯之间相隔多少米?60(5+1)=10(米)答:两盏路灯相距10米。0203060104050探究一探究一 探究二探究二 探究三探究三 探究四探究四通过以上练习你发现了什么规律？两端都种树时：段数比棵数少1。两端只种一端时：段数和树的棵数相等。两端都不种树时：段数比树的棵数多1。（棵数=段数+1）（棵数=段数）（棵数=段数-1）探究四探究四探究一探究一 探究二探究二 探究三探究三 探究四探究四练习一练习一练习一1、在100米长的马路一边种树，每隔5米种一棵。练习二练习二A、若两端都种，可以种几棵?B、若两端都不种，可以种几棵?C、若一端种一端不种，
5、可以种几棵?1005+1=21(棵)1005-1=19(棵)1005=20(棵)答:可以种21棵。答:可以种19棵。答:可以种20棵。练习二练习一练习一一根木头锯成5段需要20分钟锯成1段需要几分钟?20(5-1)=5(分钟)练习二练习二答:锯成1段需要5分钟。5(8-1)=35(分钟)答:锯成8段需要35分钟。锯成8段需要几分钟?本课小结今天你们又学习了哪些新本领?(1)两端都种树：棵树=段数+1(2)只种一端：(3)两种都不种树：棵树=段数-1棵树=段数(1)学校走廊长40米，若每隔5米放一 盆花。A、若两端都必须放盆花，则需入几盆?B、若两端不放盆花,则需放几盆?小明家住在5楼,若每层楼
6、梯有16级，则小明从底楼回家到家中，一共要走几级楼梯？团Tiffany，a 16-year-old girl，was very shy.Last September，her best friend，Sophie，moved abroad with her family because she had to continue her studies in America.She even said she would not come back for at least a few years.1 “I was really sad the moment I heard the bad news
7、 and I didnt know what to do，”Tiffany recalled.“I shut myself in my room for a whole week.It was then that my aunt took me to a sports club one Saturday and I saw so many young people playing different kinds of sports there.I signed up for a beginners course in volleyball and since then I have been
8、playing this sport.Now I practice twice a week there.It is wonderful playing sports in this club and I have made lots of friends as well.2 ”The most basic aim of playing sports is that you can improve your health even if you are not very good at sports.Besides，you can get to know a circle of people
9、at your age while playing sports.3 Since she joined the sports club，she has opened up herself and now she has become very active and enjoys meeting and talking with others.1Its polite for girls to kiss each other on the side of the face.4Its no big deal.For most people，that is one of the reasons why
10、 they join a sports club.4 You dont have to sit down and talk to strangers.You go in for sports and it is easier to understand your partners on the same team.Now Tiffany is quite popular with her friends and she has also become more confident.团圆圆一家在台湾可受欢迎了。每天，小朋友们排着长队，等着跟它们合影留念。从“排着长队”体现出每天喜欢它们的人不计其数，特别受欢迎。从“合影留念”体现出大家都想和大熊猫留住最美丽的瞬间以作纪念。Nothing can be accomplished without norms or standards.感谢阅读下载！祝你生活愉快，身体健康
