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扬州市邗江区实验小学 qinshixiang

义务教育新课程标准实验教科书. 五年级数学(上). 认识方程. 扬州市邗江区实验小学 qinshixiang. 1 、下面的式子是方程吗?为什么?. X+20=50 X+20+( )=50+8 X+20-20=50-( ). 8. 20. 2X-50=100 2X-50+50=100 ○ ( ) 2X-50 ○ ( )=100-40. +. 50. -. 40. 解方程:X+10=50. 想:解方程就是求 X=?. X+10=50. 解:. -10. =50. X+10.

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扬州市邗江区实验小学 qinshixiang

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  1. 义务教育新课程标准实验教科书 五年级数学(上) 认识方程 扬州市邗江区实验小学 qinshixiang

  2. 1、下面的式子是方程吗?为什么? X+20=50 X+20+( )=50+8 X+20-20=50-( ) 8 20 2X-50=100 2X-50+50=100○( ) 2X-50○( )=100-40 + 50 - 40

  3. 解方程:X+10=50 想:解方程就是求 X=? X+10=50 解: -10 =50 X+10 -10 X=40 X=40是不是正确答案呢? 把X=40代入原方程,看左右两边得数是否相等? 左边=40+10=50 所以X=40正确。

  4. 25 + 18 -

  5. 18 15 - - 25

  6. 58 + 58 94

  7. 根据问题意思列出方程。 1、一辆汽车每小时行使80千米,X小时行使540 千米。 2、食堂有X千克大米,吃了68千克,还剩32千克。 3、甲乙两车同时从相距400千米的两地相向而 行,甲车每小时行100千米,乙车每小时行80 千米,X小时两车相遇。 4、张老师买了8个一样的足球,付给营业员500 元,找回40元。

  8. 同学们 谢谢你们的积极参与! 再见!

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