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1、请判断下面哪些是方程，哪些不是方程？为什么(1)5x1=11 (2)83=5(3)6x (4)3x1545(5)23b=4 (6)18x=36什么叫方程？含有未知数的等式叫做方程。 等式和方程有什么关系？方程一定是等式，但等式不一定是方程。等式 方程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-
2、2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.3.3+ =4 2.5=3 0.2 =10 0.4 =1口答:(式子中数字符号各表 示什么数?)x=0.4x=50x=5.5x=0.7x x x x0.7 5.5 50 0.4Evaluation 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.
3、0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.想： X 在方程中表示什么数？ X 被减数 被减数=减数 差解方程 X 8 = 16Evaluation 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 Aspos
4、e Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.解方程 X 8 = 16X=168X=24 想一想： 怎样检验解是否正确？解： 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
5、Aspose Pty Ltd.检验 ：解方程 X 8 = 16把 X=24 代入原方程， 左边= 248=16， 右边= 16， 左边=右边， 所以 X=24 是原方程的解。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 2004-201
6、1 Aspose Pty Ltd.思考：方程的解与解方程这两个概念 有什么区别？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.做一做：1、x=3是方程5x=15的解吗？x=2呢？2、解方
7、程，并检验。20x=9 5.86x=10 5x=80Evaluation 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.在加、减、乘、除中:一个加数= 和另一个加数 被减数 =减 数 差 减数 =被减数 差
8、一个因数= 积另一个因数被除数 =除 数商除数 =被除数商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.判断：（1）等式就是方程。 （ ）（2）含有未知数的式子叫做方程。 （ ）（3）方
9、程一定是等式，等式不一定是方程。（ ）（4）x=0是方程8x=0的解。 （ ）（5）方程的解和解方程的意义相同。 （ ）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.选择题：(1)3.3
10、x=3.3,方程的解是（ ）A. x=6.6 B. x=0 C. x=1(2)5x=0.2，方程的解是（ ）A.x=25 B. x=0.04 C.x=4.8B. (3)使方程左右两边相等的未知数的值叫做（ ）A.方程 B.解方程 C.方程的解(4)求方程2x=22的解的方法是（ ）A. 222 B. 222 C. 222 D.222BBCDEvaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .N
11、ET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.用线把每个方程与它的解连在一起。16x=4.525x=1008.5x=8.5x1.2=5x24=40x2.5=2.5x=4x=11.5x=6x=1x=16x=5Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Sli
12、des for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.数学医院。x1.5=2.5解：x=2.51.5=410x=0解：x=010x=0x3=3解：x=33x=1Evaluation 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.
