(山西专版)2018年秋七年级数学上册第三章一元一次方程3.2解一元一次方程(一)—合并同类项与移项(一)课时训练(无答案)(新版)新人教版.doc

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1、13.2 解一元一次方程合并同类项与移项(一)基础练习 1.如果 2x是方程 1xa的根,那么 a的值是( )A0 B2 C 2D 62. 下列各式中,一元一次方程是( )A.1+2t. B.1-2x=0. C.m2+m=1. D. x4+1=3.3.下列变形中:由方程 125x=2 去分母,得 x-12=10;由方程 9x= 两边同除以 29,得 x=1;由方程 6x-4=x+4 移项,得 7 x=0;由方程 2- 36x两边同乘 以 6,得 12-x-5=3(x+3).错 误变形的个数是( )个A4 B 3 C2 D14.如果方程 6x+3a=22 与方程 3x+5=11 的解相同,那么

2、a= ( )A. 10 B. C. - 0 D.- 305若式子 5x-7 与 4x+9 的值相等,则 x 的值等于( ) A2 B16 C 29 D 1696. 请写出一个解为 x=-4 的一元一次方程: .7. 请用尝试、检验的方法解方程 2x+ 3x=14,得 x= .8. 若 x=2 是方程 9-2x=ax-3 的解,则 a= .9要使方程 ax=a 的解为 1,a 必须满足的条件 拓展提高10. 下列方程的解答过程是否有错误?若有错误 ,简要说明产生错误的原因,并改正.解方程: 5.2.042.3x解:原方程可化为: 25101x去分母,得 )4()3(5x去括号、移项、合并同类项,得 x 10x211. 解方程: 5124263xx.

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