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1、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.数与代数 空间与图形Evaluation only.Evaluation only. Created with Aspose.Slides
2、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.一、方程 二、公倍数和公因数 三、认识分数 四、找规律 五、分数的基本性质 Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.
3、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.一、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
4、. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.含有未知数的等式是方程。 什么是方程?例如20=180、4=200都是方程 。方程和等式有什么关系呢 ？ 我们可以用下面的图形来表示 ：方程等式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
5、.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.所有的等式都是方程。（ ）所有的方程都是等式。（ ）判断：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.Co
6、pyright 2004-2011 Aspose Pty Ltd.等式的两边同时加、减、乘 或除以同一个不等于0的数，所 得结果仍然是等式。 等式的性质：应用等式的性质，我们可以求出 方程中未知数的值。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.Copy
7、right 2004-2011 Aspose Pty Ltd.试一试 ：在填上运算符号，在里填数。 -30=24 解： =24 = 2.4+=5.6 解： =5.6 = 解完方程后我们可以将求出的未知数的值 代入原方程进行检验，你会检验吗？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
8、Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.列方程解决问题 列方程解决实际问题首先要在题中找到 相等的数量关系，再将未知数设为X。就可以 列出一个方程来了。 例：小明有邮票240张，比小亮的多32 张，小亮有邮票多少张？ 分析：小亮的邮票张数+32张=小明的邮票张数X 240 列方程得： X + 32 = 240 Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspos
9、e.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.二、公倍数和公因数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-
10、2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.公倍数一个数的倍数的个数是无限的，那么两 个数的公倍数的个数是怎样的呢？有没有 最小公倍数？有没有最大公倍数？分别写出8和10的倍数直到找到最小公 倍数为止。8的倍数： 10的倍数： 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.
11、2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.在学习中我们还发现了一些规律：（1）当大数是小数的倍数时，这两个数 的最小公倍数是 。（2）当两个数公因数只有1时，这两个数 的最小公倍数是 。 你能举出些这样的例子吗？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 Cl
12、ient Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.应用最小公倍数的知识我们还可以解 决生活中的实际问题 。试一试： 爸爸和他的同事张叔叔都参加了运动健 身中心业余羽毛球锻炼，爸爸4天去一次， 张叔叔6天去一次。5月1日他们同时在一起 打球，几月几日他们会再次相遇？Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Creat
13、ed 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.公因数 一个数的因数的个数是有限的，那么两 个数的公因数的个数是怎样的呢？有没有 最小公因数？有没有最大公因数？ 分别写出8和10的因数。 8的因数： 10的因数： 8和10的公因数有： ，最小公 因数是 ，最大公因数是 。Evaluation only.Evaluation only. Created with Aspose.Slides
14、 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.在学习中我们还发现了一些规律：（1）当大数是小数的倍数时，这两个数 的最大公因数是 。（2）当两个数公因数只有1时，这两个数 的最大公因数是 。 你能举出些这样的例子吗？Evaluation only.Evaluation only. Created wit
15、h 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.应用最大公因数的知识我们也可以解 决生活中的实际问题 。试一试： 爸爸要将10厘米和35厘米长的两根铁 棒锯成相等的小段且没有剩余，每小段最 长是多少厘米？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.三、认识分数Evaluation only.
