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用方向和距离确定位置

[教学内容]《义务教育教科书(五·四学制)·数学(五年级册)》67页。

[教学目标]

1.在具体情境中理解北偏东(西)、南偏东(西)的含义,会用方向和距离描述

物体的位置,能够看懂简单的平面图。

2.经历描述物体方向和距离的过程,进一步培养学生的观察能力、识图能力和有

条理地进行表达的能力,发展空间观念。

3.体验数学与生活的密切联系,进一步增强用数学眼光观察日常生活现象,解决

生活问题的意识。

[教学重点]能用方向和距离描述物体的位置。

[教学难点]用角度表示方向。

[教学准备]多媒体课件。

[教学过程]

一、创设情境,体现确定位置的必要性

(一)创设情境,尝试画出平面图

课件出示沙盘图(见图1)

image.png

师:说说图上有什么?

你能画一幅平面图,清晰、简洁表示出双方阵地所在的位置吗?

学生尝试画图,教师巡视,选取有代表性的平面图进行展示。


(二)讨论交流,引出确定位置的要素

展示学生画图中可能出现几种情况:

image.png

师:你觉得哪幅图更能准确的表示出它们的位置,为什么?

学生在对比中,通过师生交流,引出确定位置的两个要素:一是中心点(以指挥部为中心);二是方向(通过方向标确定红军阵地在指挥部的西北方向,蓝军阵地在指挥部东北方向)。

(三)利用冲突,体现确定位置的必要性

师:红军阵地在指挥部的西北方向,根据画的平面图,想想红军阵地的位置在哪儿,指一指。

学生到电脑屏幕前指出想象中红军阵地的位置,并说说是怎样想的

师:红军阵地的位置到底在哪儿?怎样能确定出它的准确位置呢?

小组讨论交流,全班汇报,明确通讯员要知道红军阵地在西北方向的角度和距离才能到达红军阵地。

【设计意图】引导学生根据沙盘图画出平面图,将具体形象的实际问题抽象出数学问题。学生在画图的过程中应用已有的知识经验,明确确定位置的两个要素(中心点和方向),初步确定红军阵地和蓝军阵地的方向。在现实的问题情境中,产生认知冲突,引发学生深入思考,初步感受到确定位置还应考虑到角度和距离,体现出确定位置的必要性,为进一步探究打下基础。

二、合作探究,掌握确定位置的方法

(一)自主探究,掌握确定位置的方法

出示课件,引导:红军阵地的位置就在这儿,能根据刚才的想法确定出它的准确位置吗?

学生尝试独立完成,全班交流。学生可能会有两种不同的想法:

image.png

1.确定距离

师:20千米是怎样知道的?

学生根据图例说出自己的想法。

引导:在这幅图中,它叫图例,这个1厘米的线段代表10千米。红军阵地到指挥部之间有这样的2段,所以距离是20千米。

2.确定角度

师:40°是怎样测量的?

预设:量角器中心点和指挥部重合,0刻度线和东西方向重合,测量出40°

师:这40°是从哪儿到哪儿量出来的?

学生根据测量情况,比划出这40°是从西到北量出来的。

师:从西到北量出40°,我们可以说这40°是西偏北40°。

师:50°是怎样测量的?

预设:测量50°时,中心点应该和指挥部重合,0刻度线和南北方向重合,是北偏西50°。

根据学生的回答,课件演示两种测量角度数的方法。

师:习惯上我们以南北方向为基准测量角的度数。可以说红军阵地在指挥部的北偏西50°方向。

师:蓝军阵地的位置怎样确定呢?(见图2)

预设1:蓝军阵地在指挥部北偏东方向60°,40千米处。

预设2:蓝军阵地在指挥部东偏北方向30°,40千米处。

image.png

(二)合作交流,总结确定位置的方法

师:确定一个物体的位置需要知道哪些条件?

学生通过交流,明确用中心点、方向(角度)、距离就能确定物体的位置。

【设计意图】学生通过动手操作测量角度和距离,经历确定红军阵地位置的过程,并能准确描述。在操作活动中感受到用方向和距离确定位置的科学性,在合作交流中掌握描述确定位置的方法,进一步培养学生动手操作、观察识图和有条理地进行表达的能力,发展空间观念。

三、拓展应用,体会确定位置的生活价值

    1.填一填

    课件出示(见图3)

image.png

学生独立完成,集体订正。

师:说说你是怎样确定远洋舰的位置的。

2.介绍确定位置的生活价值

师:用方向和距离确定位置在生活中应用非常广泛。台球,运动员要把目标球打进洞,需要计算一下击打目标球的方向和距离。定点跳伞,根据靶心和运动员落地点的方向和距离判定成绩。汽车导航图也是根据方向和距离确定位置的。

3.以学校为中心说说几个景点的位置

播放一组学校及周边标志性建筑的图片,让学生以学校为中心任选一处景点说说它的位置。

4.课外拓展

    师:这节课我们研究的是同一平面内用方向和距离确定位置,生活中还有还有一些不同的情况。(课件出示)这儿有两条飞机的航线,从图上看某个时刻会在这一点相遇,可是它们并没有相撞,你知道这是怎么回事?课下感兴趣的同学研究一下。

【设计意图】通过多种形式的练习,进一步巩固了用方向和距离确定位置的方法,涉及了方向的相对性,拓展学生的认识。简介确定位置的生活价值,使学生感受数学就在身边,并且引用了飞机航线的实例,将在二维空间确定位置的内容拓展到三维空间,激发了学生的学习兴趣,为学生后续学习打下基础。

四、回顾反思,总结提升

师:这节课你们有哪些收获?

预设1:学会了用方向和距离确定位置;

预设2:会看平面图,会用北偏西、北偏东、南偏西、南偏东描述方向;

预设3:会用方向和距离确定位置解决生活中的实际问题;

……

师:看来同学们收获还真不少!我们不但收获了知识,而且还学会了用数学知识解决生活问题。

【设计意图】在这个环节中,师生共同回顾本节课在知识与技能、过程与方法以及情感态度方面的收获,学生总结概括能力得到发展。

[板书设计]


image.png




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    Warning: Use of undefined constant pf2 - assumed 'pf2' (this will throw an Error in a future version of PHP) in /home/wwwroot/zhaizhaolei123/wwwroot/product/default/viewmb.php on line 404

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    5
  • 写评价赚积分

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  • 交易规则

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      本平台采用的是类似淘宝的担保交易形式,整个交易过程由平台进行担保,买家付款后钱款进入平台账户,买家收到宝贝确认无误后,平台打款到商家账户,确保整个交易流程公正。


资料默认是以百度网盘链接的形式自动发送,付款后立马即可收到,无需等待。


退款情形:

 

一、实际资料与宝贝详情描述不符的:

(1)版本信息不符,如:宝贝描述显示是人教版,结果收到的链接是其他版本的;

(2)资料与现行教材不配套的,如:宝贝详情里标明为最新资料,实际为旧版资料的;

(3)收到的资料宝贝详情所列资料不同,挂羊头卖狗肉的;

(4)宝贝详情里标明有的资料实际没有或者资料缺失不完整的;

(5)资料整理乱、差、重复、缺失的;

注:个别版本的资料及其稀缺,暂时无法保证完整的,需在宝贝详情里标明,否则责任归咎于商家。


二、商家拒绝履行售后服务的:

(1)收到资料无法打开,或打开为乱码的,商家不协助解决的;

(2)资料中个别文档无法正常使用,商家不予替换或修复的;

(3)资料在下载过程中出现问题,商家拒绝指导的;

      (4)商家未履行相关承诺的;

注:有时咨询就多,为节约您的时间,常见问题可以自行解决:资料打不开?95%都是因为:①您没有安装解压软件,点此下载安装解压软件;②您没有安装办公软件,点此下载办公软件;③swf格式的文件打不开,点此下载qq影音;④PDF格式文档打不开,点此下载PDF阅读器。这些都是常用办公必备软件哦!


注:满足以上情形者均无条件退款!


1、在未拍下前,双方在QQ上所商定的内容,亦可成为纠纷评判依据(商定与描述冲突时,商定为准);

2、在没有"无任何正当退款依据"的前提下,写有"一旦售出,概不支持退款"等类似的声明,视为无效声明;

3、虽然交易产生纠纷的几率很小,但请尽量保留如聊天记录这样的重要信息,以防产生纠纷时便于网站工作人员介入快速处理。


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