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解方程(二)

解方程(二). 河阳中学 许国栋. 一.创设情景 引入问题. 二、合作讨论,探究解法 解上面所列出的方程. 解方程: 4 ( X+0.5 ) +X=17 解:去括号,得: 4X+2+X=17 移项,得: 4X+X=17-2 合并同类项,得 : 5X=15 方程两边同除以 5 ,得 X=3. 三、分层练习,掌握解法. 解下列方程 ( 1 ) 5 ( X-1 ) =10 ( 2 ) 2- ( 1-X ) =-2 ( 3 ) 11X+1=5 ( 2X+1 ) ( 4 ) 4X-3 ( 20-X ) =3.

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解方程(二)

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  1. 解方程(二) 河阳中学 许国栋

  2. 一.创设情景 引入问题

  3. 二、合作讨论,探究解法解上面所列出的方程 • 解方程:4(X+0.5)+X=17 解:去括号,得: 4X+2+X=17 移项,得: 4X+X=17-2 合并同类项,得 :5X=15 方程两边同除以5,得 X=3

  4. 三、分层练习,掌握解法 • 解下列方程 (1)5(X-1)=10 (2)2-(1-X)=-2 (3)11X+1=5(2X+1) (4)4X-3(20-X)=3

  5. 四、合作交流,比较解法 • 对于(1) 5(X-1)=10 你还有其它的解法吗? • 方法二: 解:方程两边同除以5,得 X-1=2 移项, 得 X=2+1 即 X=3

  6. 五、回顾总结、布置作业 • 通过本节课的学习,你有哪些收益? • 还有什么问题吗? • 作业: P158 习题5.4 1.2

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