人教新课标五年级数学上册人教新课标五年级数学上册Evaluation only.Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.Evaluation only.Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.Evaluation only.Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.Evaluation only.Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.Evaluation only.Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.Evaluation only.Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.高高底底宽宽长长平行四边形平行四边形底底高高面面 积积长方形长方形长长宽宽面面 积积6 6米米4 4米米2424平方米平方米6 6米米4 4米米2424平方米平方米( (一个方格代表1m2，不满一格的都按半格计算) )Evaluation only.Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.Evaluation only.Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.1.1.利用你手中的学具利用你手中的学具, ,剪一剪、拼一拼，剪一剪、拼一拼，试把平行四边形转化为长方形。试把平行四边形转化为长方形。2.2.观察拼出的长方形和原来的平行四边观察拼出的长方形和原来的平行四边形，你发现了什么？形，你发现了什么？3.3.由长方形的面积由长方形的面积= =长长宽宽, , 你发现平你发现平行四边形面积的计算方法是什么行四边形面积的计算方法是什么? ?Evaluation only.Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.Evaluation only.Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.高高底底宽宽长长平行四边形面积的计算平行四边形面积的计算结论结论: 平行四边形平行四边形转化成了转化成了长方形长方形所所 以以 :平行四边形的面积平行四边形的面积=底底高高 因因 为为: 长长 方方 形形 的的 面面 积积 = 长长 宽宽平行四边形可以转化成一个长方形，平行四边形可以转化成一个长方形，长方形长方形的的面积与原来平行四边形的面积面积与原来平行四边形的面积。 长方形的长与原来平行四边形的底长方形的长与原来平行四边形的底 。 长方形的宽与原来平行四边形的高长方形的宽与原来平行四边形的高 。 相等相等相等相等相等相等Evaluation only.Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.Evaluation only.Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.S=aha ah hs sEvaluation only.Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.Evaluation only.Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd. 沿平行四边形的任意一条高剪开、平沿平行四边形的任意一条高剪开、平移，都可以得到长方形。移，都可以得到长方形。Evaluation only.Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.Evaluation only.Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.Evaluation only.Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.Evaluation only.Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.例1 平行四边形花坛的底是6米，高是4米，它的面积是多少？4米6米 S=ah=6 S=ah=64 42424（平方米）（平方米） 答：它的面积是答：它的面积是2424平方米。平方米。Evaluation only.Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.Evaluation only.Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd. 1 1、填空：、填空： 任意一个平行四边形都可以转化成一个长方形，任意一个平行四边形都可以转化成一个长方形，它的面积与原来平行四边形的面积它的面积与原来平行四边形的面积( )( )。 这个长这个长方形的长与原来平行四边形的方形的长与原来平行四边形的( )( )相等，这个长相等，这个长方形的宽与原来平行四边形的方形的宽与原来平行四边形的( )( )相等。因为长相等。因为长方形的面积方形的面积=( )=( )，所以平行四边形的面积，所以平行四边形的面积 =( =( ) )。 一个平行四边形的底是一个平行四边形的底是一个平行四边形的底是一个平行四边形的底是9 9 9 9厘米，高是厘米，高是厘米，高是厘米，高是3 3 3 3分米，它的分米，它的分米，它的分米，它的面积是（面积是（面积是（面积是（ ）平方厘米。）平方厘米。）平方厘米。）平方厘米。相等相等底底高高长长宽宽底底高高270270Evaluation only.Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.Evaluation only.Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.2 2 火眼金睛辨对错。火眼金睛辨对错。 两个平行四边形的高相等，它们两个平行四边形的高相等，它们的面积就一定相等。的面积就一定相等。( )( ) 平行四边形的底是平行四边形的底是2020米米, ,高是高是1616米米, , 它的面积是它的面积是320320米。（米。（ ） 一块平行四边形菜地的面一块平行四边形菜地的面积是积是2828平方米，底长平方米，底长7 7米，它的米，它的高是高是4 4米。（米。（ ）Evaluation only.Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.Evaluation only.Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.2 2米米米米3 3米米米米2.7米米 图中平行四边形的面积是图中平行四边形的面积是图中平行四边形的面积是图中平行四边形的面积是（ ） A A A A2 2 2 22.72.72.72.75.4(5.4(5.4(5.4(平方米平方米平方米平方米) ) ) ) B B B B3 3 3 32.72.72.72.78.1(8.1(8.1(8.1(平方米平方米平方米平方米) ) ) ) C C C C3 3 3 32 2 2 26 6 6 6（平方米）（平方米）（平方米）（平方米） 图中两个平行四边形的面积（图中两个平行四边形的面积（图中两个平行四边形的面积（图中两个平行四边形的面积（ ） A A A A 不相等不相等不相等不相等 B B B B 相等相等相等相等 C C C C 无法判断无法判断无法判断无法判断将正确答案的序号填在括号里。将正确答案的序号填在括号里。3 3C CB BEvaluation only.Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.Evaluation only.Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd. 本节课我们主要学习了哪些内容？同桌之间互相讨论一下！Evaluation only.Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.Evaluation only.Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.