利用等式的性质解方程(1) ;X-7=5 (2) ;7X=6X-4解:方程的两边都加7,解:方程的两边都减去 , 得 X=5+7 得 7X-6X=-4 即 X=12 合并同类项得 X=-4 移项 化系数用谜语来引入一元一次方程,能够很好吸引学生的兴趣。通过上面两小题,对用等式性质解方程进行巩固、回忆,为讲解新方法奠定基础. 回复 ...
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