2018年秋七年级数学上册第4章一元一次方程4.2解一元一次方程4.2.2用移项与合并同类项解一元一次方程导学课件新版苏科版201901112116.pptx

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1、第4章 一元一次方程,4.2 解一元一次方程,第2课时 用移项与合并同 类项解一元一次方程,目标突破,总结反思,第4章 一元一次方程,知识目标,4.2 解一元一次方程,知识目标,1依据等式的基本性质对方程变形,通过观察、对比,理解移项的概念和理论根据 2通过观察计算,能用移项、合并同类项、系数化为1解一元一次方程,目标突破,目标一 理解移项的概念,4.2 解一元一次方程,B,4.2 解一元一次方程,4.2 解一元一次方程,【归纳总结】移项的方法: (1)移动的项一定要从方程的一边移到另一边,而不是在方程的一边交换位置; (2)移项时必须变号,不变号不能移项; (3)未移动的项仍然保持不变,目标

2、二 能通过移项、合并同类项解一元一次方程,4.2 解一元一次方程,解析 直接移项、合并同类项、系数化为1,可得出答案,4.2 解一元一次方程,4.2 解一元一次方程,【归纳总结】 解简单的一元一次方程的一般步骤:,总结反思,知识点一 移项的概念及依据,小结,4.2 解一元一次方程,方程中的某些项改变_后,可以从方程的_移到_,这样的变形叫做移项 移项的依据是_,移项时一般将含有未知数的项移到_,将常数项移到_,符号,一边,另一边,等式的基本性质1,方程的左边,方程的右边,知识点二 系数化为1的方法及依据,4.2 解一元一次方程,等式的基本性质2,反思,4.2 解一元一次方程,4.2 解一元一次方程,

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