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1、方程的意义人教版五年级数学上册人教版五年级数学上册Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.天平的使用方法天平的使用方法1.将天平放置在水平的地方,指针对准中央刻度线,天平处于平衡状态。2.左托盘放称量物,右托盘放砝码。3.称量物体时,指针对准中央刻度线,说明左盘物体的质量与右盘砝码质量相等。4.一架天平都配有一套大小不同的砝码,使用 砝码时要用镊子夹取,用完后放回到砝码盒。Evaluation only.Cr
2、eated with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.1.称空杯子质量空杯子=100gEvaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.2.在杯中加满水100+x100Evaluation only.Created with Aspose.Slides for .NET 3.5 Cl
3、ient Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.3.在右盘加砝码100+x300100+x200Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.4.把右盘中的1个100g的砝码换成50g的砝码。100+x=250Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5
4、.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.认真观察认真观察:100+x=250100+x=250这是一个等式吗?这是一个等式吗?这个等式有什么特点?这个等式有什么特点?Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.1.方程的意义:方程的意义: 含有含有未知数未知数的的等式等式叫做方程。叫做方程。2.2.判断方程的两个条件:判断方程的两个条件:必须是等式。必须是等式。必须含有
5、未知数。必须含有未知数。Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.方程与等式之间方程与等式之间 的关系的关系等 式方程方程方程一定是等式;但等式不一定是方程。Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd. 巩固练习巩固练习35+65
6、=100( ) x-1472( ) y+24 ( ) 5x+32=47 ( ) 2816+14( ) 6(a+2)=42( ) 下面哪些式子是方程?下面哪些式子是方程?Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.判断题(1)含有未知数的等式是方程)含有未知数的等式是方程( )(2)含有未知数的式子是方程)含有未知数的式子是方程( )(3)方程是等式,等式也是方程)方程是等式,等式也是方程( )(4)30是方程是方
7、程( )(5)420含有未知数,所以它是方程含有未知数,所以它是方程( )XXXEvaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.张强也列了两了式子,不小心被墨水弄脏张强也列了两了式子,不小心被墨水弄脏了。猜猜他原来列的是不是方程?了。猜猜他原来列的是不是方程?(1) 6X + =78 (2) 36 + =42 Evaluation only.Created with Aspose.Slides for .NET 3.
8、5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.看图列出方程。X50X2X = 50X73166X + 73 = 166继续Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd. 通过这一节课的学习,你通过这一节课的学习,你有哪些收获?有哪些收获?Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.谢谢!再见Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.