人教版数学五年级上册课件-05简易方程-02解简易方程-课件03

1、小学数学五年级课件（人教版） 解简单的方程Evaluation Warning : The document was created with Spire.Presentation for .NET13+x=37 x-35=90说说下列方程的解答过程。返回解：13+x-13=37 -13 x=24解： x-35+35=90+35 x=125 Evaluation Warning : The document was created with Spire.Presentation for .NET解方程 3x18。 例题2说一说你的想法。返回Evaluation Warning : The do

2、cument was created with Spire.Presentation for .NET3x = 18解：3x( ) = 18( ) x = ( )336我是借助天平来解答的。等式两边同时除以一个不为0的数，左右两边仍然相等。依据是什么？返回Evaluation Warning : The document was created with Spire.Presentation for .NET规范解答解方程 3x18。 3x18解：3x3183x6例题2返回Evaluation Warning : The document was created with Spire.Pres

3、entation for .NET解方程 20 x9例题3说一说你的想法。你遇到了什么困难？返回Evaluation Warning : The document was created with Spire.Presentation for .NET20 x9解：20 x20920 x920？上面的解法对吗？说一说你们是如何解决这个问题的？返回Evaluation Warning : The document was created with Spire.Presentation for .NET规范解答20 x9x11解：20 xx9x209x9x209x9209等式两边加上相同的式子，左

4、右两边仍然相等。xx返回Evaluation Warning : The document was created with Spire.Presentation for .NETx=11是不是正确的答案呢？检验一下。检验：方程左边20 x 2011 9 方程右边所以，x11是方程的解。返回Evaluation Warning : The document was created with Spire.Presentation for .NET12.6元x元x元x元1.列方程并解答。 解：3x312.633x12.6x4.2返回Evaluation Warning : The document

5、 was created with Spire.Presentation for .NET1. 列方程并解答。 18元x元x元x元解：3x18x63x3183返回Evaluation Warning : The document was created with Spire.Presentation for .NET（1）解方程4x=28时，方程两边要同时( )。（2）解方程x5=9时，方程两边要同时( ) 。（3）方程9x=10.8的解是( ) 。除以4乘51.2 2.我会填。返回Evaluation Warning : The document was created with Spire

6、.Presentation for .NET（1）12x=72解：12x12=7212 x=6解：x0.90.9=300.9 x=27 3.解下列方程。（2）x0.9=30返回Evaluation Warning : The document was created with Spire.Presentation for .NET4.一块长方形菜地的面积是259平方米，这块 菜地的长是18.5米，宽是x米。请你列出方 程并解答。 解：18.5x=25918.5x18.5=259 18.5 x=14 答：宽是14米。返回Evaluation Warning : The document was created with Spire.Presentation for .NET解方程形如ax=b的方程解：axa=ba x=ba形如ax=b的方程解：ax+x=b+x b+x=a x=a-b等式的性质2等式的性质1返回Evaluation Warning : The document was created with Spire.Presentation for .NET1.从