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4.2 解一元一次方程( 4 )

初中数学. 七年级 ( 上册 ). 4.2 解一元一次方程( 4 ). 作 者:王新奇( 苏州工业园区星湾学校 ) . 复习. 解方程: (1) (2) 4 x - 8 = 12. (1) 比较结果和形式,它们有什么相同之处和不同之处? (2) 它们是通过怎样变形得到的? 问题:如何去分母 ?. 例题. 例 1 . 解方程:. ( 1 ) ( 2 ). 强调: (1) 去分母时不能“漏乘”; (2) 不跳步.. 例题. 例 2 . 解方程:.

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4.2 解一元一次方程( 4 )

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  1. 初中数学 七年级(上册) 4.2 解一元一次方程(4) 作 者:王新奇(苏州工业园区星湾学校) 

  2. 复习 解方程: (1)(2) 4x-8=12 (1)比较结果和形式,它们有什么相同之处和不同之处? (2)它们是通过怎样变形得到的? 问题:如何去分母?

  3. 例题 例1.解方程: (1) (2) 强调: (1)去分母时不能“漏乘”; (2)不跳步.

  4. 例题 例2.解方程: (1) (2) 提示:先观察方程的特点,分别扩大为原来的10倍. 想一想:方程(1)还有其他解法吗?

  5. 例题 例3. 若 是方程 的解,求代数式 的值.

  6. 拓展 定义新运算“*”如下:a*b= (1) 求5*(-5) ; (2) 解方程:2*(2*x)=1*x.

  7. 巩固 1 .解方程: (1)(2) 2.解方程: (1) (2) 3.若代数式 与代数式 的 值相等,求y的值.

  8. 讲一讲 本节课你有什么收获?

  9. 作业 课本P103 练一练1,课本P104 习题6.

  10. 谢 谢!

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