人教新课标数学五年级上册植树问题.pptx

单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,#,伊宁市第十四小学,人教新课标四年级数学下册,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,植树问题,人教新课标四年级数学下册,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,教学目标,本节课我们来学习植树问题，同学们要根据生活中的实际例子去探索两棵树的间距，植树的棵树以及总的植树距离之间有怎么样的关系，注意要分两端都植树，一端植树以及两端都不植树等情况进行讨论。,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,同学们在全长,20,米的小路,一边,植树，每隔,5,米栽一棵,一共需要多少棵树苗？,设计一份植树方案,并说明理由。,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,同学们在全长,20,米的小路,一边,植树，每隔,5,米栽一棵（,两端要栽,）。一共需要多少棵树苗？,20,米,5,米,20 5=4 4+1=5,（棵）,答,:,一共需要,5,棵树苗。,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,两端都栽的植树问题,棵数,=,间隔数,+1,间隔数,=,棵数,1,全长,间距,=,间隔数,全长,间隔数,=,间距,间隔数,间距,=,全长,（棵数,1),间距,=,全长,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,同学们在全长,20,米的小路,一边,植树，每隔,5,米栽一棵（,两端都不栽,）。一共需要多少棵树苗？,5,米,20,米,20,5=4 4-1=3,（棵）,答,:,一共需要,3,棵树苗。,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,大象馆和猩猩馆相距,60,米。绿化队要在两馆间的小路两旁栽树，相邻两棵树之间的距离是,3,米。一共要栽几棵树？,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,603=20,（）2,（）,20,（）（）,答：一共要栽 棵树。,1,19,19,38,38,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,一根木头长,10,米，要把它平均分成,5,段。每锯下一段需要,8,分钟，锯完一共要花多少分钟？,5-1=4(,次,)84=32(,分,),答,:,锯完一共要花,32,分钟,.,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,两端都不栽的植树问题,棵数,=,间隔数,1,间隔数,=,棵数,+1,棵数,=,全长,间距,1,全长,=,间距,（棵数,+1,）,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,同学们在全长,20,米的小路,一边,植树，每隔,5,米栽一棵（,只栽一端,）。一共需要多少棵树苗？,205=4(,棵,),答,:,一共需要,3,棵树苗。,20,米,5,米,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,39,路公共汽车行驶路线全长,12,千米，相邻两站的距离是,1,千米，一共有几个车站？,121=12,12+1=13(,个,),答,:,一共有,13,个车站。,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.,学校教学楼每层楼梯有,24,个台阶，老师从一楼开始一共走了,72,个台阶。老师走到了第几层？,7224=3,3+1=4(,层,),答,:,老师走到了第,4,层。,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,走楼梯，每,2,层之间的台阶是,20,个，我上到,5,层，我走了多少个小台阶？,5-1=4,204=80(,个,),答,:,我走了,80,个小台阶。,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,园林工人沿公路一侧栽树，每隔,6,米种一棵，一共种了,36,棵。从第,1,棵到最后一棵的距离有多远？,36-1=35(,段,),356=210(,米,),答,:,从第,1,棵到最后一棵的距离有,210,米。,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,在一条全长,2,千米的街道两旁安装路灯,（两端也要安装），每隔,50,米安装一座，,一共要安装多少座路灯？,200050=40,40+1=41(,座,),412=82(,座,),答,:,一共要安装,82,座路灯。,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,笔直的跑道一旁插着,51,面小旗，,它们的间隔是,2,米，现在要改为只,插,26,面小旗，间隔应改为多少米？,51-1=50(,段,),502=100(,米,),26-1=25(,段,),10025=4(,米,),答,:,间隔应改为,4,米。,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,同学们在全长,20,米的小路一边植树，每隔,5,米栽一棵（两端要栽）。一共需要多少棵树苗？,205,4,这里共有,4,个间隔，所以一共要栽（）棵树。,5,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,酒店里的大钟,4,时敲,4,下，,6,秒敲完，,10,时敲响,10,下，需要多长时间？,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,圆形花坛的一周全长,50,米，如果沿着这一圈每隔,2,米摆放一盆花，一共需要多少盆花？,502=25(,盆,),答,:,一共需要,25,盆花。,圆形,:,棵数,=,段数,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,在封闭的线路上种树,棵树,=,间隔数,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,19,1917,17,192,172,72,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,184,72,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,你还有其它的方法吗？试试看！,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,16,棵,14,棵,12,棵,沿正方形的池塘边植树，要求每边都植,4,棵，一共需要多少棵树苗？,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,（,一）巩固提高题,1,、沿一个正三角形实验田的外边，每边 种,8,棵向日葵最少能种几棵？,2,、,16,名学生在操场上做游戏，围成一个正方形，每边人数相等。四个顶点都有人，每边各有几名学生？若相邻两个同学之间相隔,1,米，围成的正方形的边长是多少米？,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,（二）课后延伸题,1,、“四（,4,）班”召开班会时，同学们围坐在一起，如果每边做,5,人，（如下图），这个班一共有多少个同学？每边都有,5,张课桌，一共要多少张课桌子？,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,2,、公园里的花坛有以下几种形状，请选择一种你最喜欢的形状，计算一下如果每边放,4,盆花，至少一共可以摆放多少盆花？,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,考考你,本节课同学们都学了哪些内容,?,你能画一些简单的示意图来表示植树问题不同情况吗？并写出你的解题的方法。试试看！,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,