2022年2022年解一元一次方程练习题及答案及知识点 .pdf

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1、relationship, establishe d equivalent relationship 14, and subject: appli cation problem (4)-scores and per centage application problem review conte nt overview answers scores, and percentage application problem of key is: according to meaning, (1) determine standard volume (units 1) (2) find associ

2、ate volume rate corresponds to relationship, Then in -line sol ution. Category fraction multiplication word probl em score Division appli cations engineering pr oblem problem XV, a subject: review of the measurement of the amount of capacit y, measurement and units of measurement of common units of

3、measurement and their significance i n rate 1, currency, length, area, volume, unit size, volume, weight and rate. (Omitted) 2, commonly used time units and their relationships. (Slightly) with a measurement units Z hijian of of poly 1, and of method 2, and poly method 3, and of method and poly meth

4、od of relationship measurement distance of method 1, and tool measurement 2, and estimates 16, and subject: geometry preliminary knowledge (1)-line and angle review content line, and segment, and Ray, and vertical, and parallel, and angle angle of classification (slightly) 17, and subject: geometry

5、preliminary knowledge (2)-plane graphi cs review content triangle, and edges shaped, and round, and fan axisymmetric graphics perimeter and area combination graphics of area subject : Preliminary knowledge (3)-review of solid content category 1-d shapes are divided into: cylinder and cone 2, column

6、is divi ded into: cuboid, square 3, cone cone of the features of cuboids and cubes relationship between characteristics of circular cone is slightly solid surfa ce area and volume 1, size 2, table .和解一元一次方程一、慧眼识金（每小题3 分，共 24 分）1某数的15等于 4 与这个数的45的差 , 那么这个数是【】 (A)4 (B)-4 (C)5 (D)-5 2若32113xx，则4x的值为【】

7、(A) (B)- (C)- (D)若ab，则1133ab；1134ab；3344ab；3131ab中，正确的有【】 (A) 个 (B)个 (C)个 (D)个下列方程中，解是1x的是【】 (A)2(2)12x (B)2(1)4x (C)1115(21)xx (D)2(1)2x下列方程中，变形正确的是【】 3443xx(A) 由得232xx(B) 由3=得552xx(C) 由2-得5252xx(D) 由得6对于“xyab” ，下列移项正确的是【】 (A)xbya (B)xayb (C)axyb (D)axby7某同学在解关于x的方程513ax时，误将x看作x，得到方程的解为2x，则原方程的解为【】

8、 (A)3x (B)0 x (C)2x (D)1x小丽的年龄乘以3 再减去 3 是 18，那么小丽现在的年龄为【】 (A)7 岁 (B)8岁 (C)16岁 (D)32岁二、画龙点睛（每小题3 分，共 24 分）1在3510 xxx，中，是方程432xx的解若m是3221xx的解，则3010m的值是当x时，代数式1(25)2x与1(92)3x的差为如果154m与14m互为相反数，则m的值为名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 1 页，共 8 页 - - - - - - - -

9、 - relationship, establishe d equivalent relationship 14, and subject: appli cation problem (4)-scores and per centage application problem review conte nt overview answers scores, and percentage application problem of key is: according to meaning, (1) determine standard volume (units 1) (2) find ass

10、ociate volume rate corresponds to relationship, Then in -line sol ution. Category fraction multiplication word probl em score Division appli cations engineering pr oblem problem XV, a subject: review of the measurement of the amount of capacit y, measurement and units of measurement of common units

11、of measurement and their significa nce i n rate 1, currency, length, area, volume, unit size, volume, weight and rate. (Omitted) 2, commonly used time units and their relationships. (Slightly) with a measurement units Z hijian of of poly 1, and of method 2, and poly method 3, and of method and poly

12、method of relationship measurement distance of method 1, and tool measurement 2, and estimates 16, and subject: geometry preliminary knowledge (1)-line and angle review content line, and segment, and Ray, and vertical, and parallel, and angle angle of classification (slightly) 17, and subject: geome

13、try preliminary knowledge (2)-plane graphi cs review content triangle, and edges shaped, and round, and fan axisymmetric graphics perimeter and area combination graphics of area subject : Preliminary knowledge (3)-review of solid content category 1-d shapes are divided into: cylinder and cone 2, col

14、umn is divi ded into: cuboid, square 3, cone cone of the features of cuboids and cubes relationship between characteristics of circular cone is slightly solid surfa ce area and volume 1, size 2, table .和已知方程1(2)60aax是关于x的一元一次方程，则a如果3123xx成立，则x的正数解为已知384xxa的解满足20 x，则1a若3 2224kxk是关于x的一元一次方程， 则k，x三、考考你

15、的基本功（本大题共40 分）解下列方程（每小题3 分，共 12 分）（1）76226xx；（2）4352xx；（3）453xx；（4）3735yy2 （ 8 分）2x是方程40ax的解，检验3x是不是方程2534axxa的解3 （ 10 分）已知236mxm是关于x的一元一次方程，试求代数式2008(3)x的值4 （ 10 分）如果3346xyz，求346xyz的值四、同步大闯关（本大题12 分）方程4231xmx和方程3241xmx的解相同，求m的值和方程的解（下列题目供各地根据实际情况选用）关于x的方程23mxnx中，mn、是常数， 请你给mn、赋值，并解此时关于x的方程名师资料总结 -

16、- -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 2 页，共 8 页 - - - - - - - - - relationship, establishe d equivalent relationship 14, and subject: appli cation problem (4)-scores and per centage application problem review conte nt overview answers scores, and percentage applicati

17、on problem of key is: according to meaning, (1) determine standard volume (units 1) (2) find associate volume rate corresponds to relationship, The n in-line sol ution. Category fraction multiplication word probl em score Division appli cations engineering pr oblem problem XV, a subject: review of t

18、he measurement of the amount of capacit y, measurement and units of measurement of common units of measurement and their significance i n rate 1, currency, length, area, volume, unit size, volume, weight and rate. (Omitted) 2, commonly used time units and their relationships. (Slightly) with a measu

19、rement units Z hijian of of poly 1, and of method 2, and poly method 3, and of method and poly method of relationship measurement distance of method 1, and tool measurement 2, and estimates 16, and subject: geometry preliminary knowledge (1)-line and angle review content line, and segment, and Ray,

20、and vertical, and parallel, and angle angle of classification (slightly) 17, and subject: geometry preliminary knowledge (2)-plane graphi cs review conte nt triangle, and edges shape d, and round, and fan axisymmetric graphics perimeter and area combination graphics of area subject : Preliminary kno

21、wledge (3)-review of solid content category 1-d shapes are divided into: cylinder and cone 2, column is divi ded into: cuboid, square 3, cone cone of the features of cuboids and cubes relationship between characteristics of circular cone is slightly solid surfa ce area and volume 1, size 2, table .和

22、解一元一次方程一、相信你都能选对（每小题2分，共 16分）1、下列方程中是一元一次方程的是（）A、x-y=2005 B、3x-2004 C、x2+x=1 D、21x=32x2、下列四组变形中，属于去括号的是（） A.5x+3=0,则5x=-3 B.12x = 6,则x = 12 C.3x-(2-4x)=5,则3x+4x-2=5 D.5x=1+4,则5x=5 3、某同学在方程 5x- 1=x+3时， 把处的数字看错了，解得 x=-4/3,该同学把看成了 （）A.3 B.-8 C. 8 D. -3 4、 方程12 x - 3 = 2 + 3x的解是 ( ) A.-2; B.2; C.-12; D.

23、125、下列解方程去分母正确的是( ) A.由1132xx, 得 2x - 1 = 3 - 3x; B.由232124xx, 得2(x - 2) - 3x - 2 = - 4 C. 由131236yyyy, 得3y + 3 = 2y - 3y + 1 - 6y; D. 由44153xy, 得 12x - 1 = 5y + 20 6、某件商品连续两次9折降价销售 , 降价后每件商品售价为a元, 则该商品每件原价为( ) A.0.92a B.1.12a C.1.12a D.0.81a7、一个两位数， 个位数字与十位数字的和是9，如果将个位数字与十位数字对调后所得的新数比原数大 9，则原来的两位数为

24、（） A54 B27 C72 D45 8、一个长方形的周长为26 cm，这个长方形的长减少1 cm，宽增加 2 cm，就可成为一个正方形，设长方形的长为xcm，可列方程（） A1(26)2xx B1(13)2xx名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 3 页，共 8 页 - - - - - - - - - relationship, establishe d equivalent relationship 14, and subject: appli cation probl

25、em (4)-scores and per centage application problem review conte nt overview answers scores, and percentage application problem of key is: according to meaning, (1) determine standard volume (units 1) (2) find associate volume rate corresponds to relationship, Then in -line sol ution. Category fractio

26、n multiplication word probl em score Division appli cations engineering pr oblem problem XV, a subject: review of the measurement of the amount of capacit y, measurement and units of measurement of common units of measurement and their significa nce i n rate 1, currency, length, area, volume, unit s

27、ize, volume, weight and rate. (Omitted) 2, commonly used time units and their relationships. (Slightly) with a measurement units Z hijian of of poly 1, and of method 2, and poly method 3, and of method and poly method of relationship measurement distance of method 1, and tool measurement 2, and esti

28、mates 16, and subject: geometry preliminary knowledge (1)-line and angle review content line, and segment, and Ray, and vertical, and parallel, and angle angle of classification (slightly) 17, and subject: geometry preliminary knowledge (2)-plane graphi cs review content triangle, and edges shaped,

29、and round, and fan axisymmetric graphics perimeter and area combination graphics of area subject : Preliminary knowledge (3)-review of solid content category 1-d shapes are divided into: cylinder and cone 2, column is divi ded into: cuboid, square 3, cone cone of the features of cuboids and cubes re

30、lationship between characteristics of circular cone is slightly solid surfa ce area and volume 1, size 2, table .和C1(26)2xx D1(13)2xx二、相信你填得又快又准（每小题2分, 共16分）9、去括号且合并含有相同字母的项：（1）3x+2(x-2)= (2)8y-6(y-2)= 10、 x = 3 和 x = - 6中,_ 是方程 x - 3(x + 2) = 6的解 . 11、若代数式213k的值是 1, 则k = _. 12、当x=_时，式子322x与23x互为相反数

31、 . 13、小明买了 20本练习本，店主给他八折优惠，结果便宜1.6 元，每本练习本的标价是元 。14、如果方程 2x+4=0 的解与方程 4x+m=8 的解相同，则m= . 15、三个连续偶数的和为18, 设最大的偶数为 x, 则可列方程 _. 16、甲水池有水31吨, 乙水池有水 11吨, 甲池的水每小时流入乙池2吨,x 小时后 , 乙池有水_吨 , 甲池有水 _吨 , _小时后 , 甲池的水与乙池的水一多. 三、相信你都能做对17、解方程 ( 每小题 5分，共 20分）(1)3(x+2)-2(x+2)=2x+4 (2)2(10-0.5y)=-(1.5y+2) (3)341125xx (4

32、)432.50.20.05xx18、今年父子的年龄之和是50，且父亲的年龄是儿子的4倍，求儿子今年多少岁？（6分）19、全班同学去划船，如果减少一条船，每条船正好坐9位同学；如果增加一条船，每条船上正好坐 6位同学。问这个班有多少位同学？（6分）名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 4 页，共 8 页 - - - - - - - - - relationship, establishe d equivalent relationship 14, and subject: a

33、ppli cation problem (4)-scores and per centage application problem review conte nt overview answers scores, and percentage application problem of key is: according to meaning, (1) determine standard volume (units 1) (2) find associate volume rate corresponds to relationship, The n in-line sol ution.

34、 Category fraction multiplication word probl em score Division appli cations engineering pr oblem problem XV, a subject: review of the measurement of the amount of capacit y, measurement and units of measurement of common units of measurement and their significance i n rate 1, currency, length, area

35、, volume, unit size, volume, weight and rate. (Omitted) 2, commonly used time units and their relationships. (Slightly) with a measurement units Z hijian of of poly 1, and of method 2, and poly method 3, and of method and poly method of relationship measurement distance of method 1, and tool measure

36、ment 2, and estimates 16, and subject: geometry preliminary knowledge (1)-line and angle review content line, and segment, and Ray, and vertical, and parallel, and angle angle of classification (slightly) 17, and subject: geometry preliminary knowledge (2)-plane graphi cs review conte nt triangle, a

37、nd edges shape d, and round, and fan axisymmetric graphics perimeter and area combination graphics of area subject : Preliminary knowledge (3)-review of solid content category 1-d shapes are divided into: cylinder and cone 2, column is divi ded into: cuboid, square 3, cone cone of the features of cu

38、boids and cubes relationship between characteristics of circular cone is slightly solid surfa ce area and volume 1, size 2, table .和20、 （爷爷与孙子下棋，爸爸赢一盘记为1分，孙子赢一盘记为3分，两人下了12盘（未出现和棋）后，得分相同，他们各赢了多少盘？（6分）21、一项工程，甲独立做需要20天完成，乙独立完成需要30天完成，丙独立完成需要40天。开始三人合作，后来甲另外有事离开，由乙和丙继续合作，全部工作共用了12天完成，问甲工作了几天？（6分）四、能力与拓

39、展22、 A、B两地相距 600千米，一列慢车从A地开出，每小时行80千米，一列快车从B地开出，每小时行 120千米，两车同时开出。（1）若同向而行，出发后多少小时相遇？（2）若相背而行，多少小时后，两车相距800千米？（3）若两车同向而行，快车在慢车后面，多少小时后，快车追上慢车？（4）若两车同向而行，慢车在快车后面，多少小时后，两车相距760千米？23、 （12分）经营户小王在蔬菜批发市场上了解到以下信息内容：蔬菜品种红辣椒黄瓜西红柿茄子批发价（元 / 公斤）4 12 16 11 零售价（元 / 公斤）5 14 20 13 他共用 116元钱从市场上批发了红辣椒和西红柿共44公斤到菜市场去

40、卖。（1）请计算小王买红辣椒和西红柿各多少公斤？（2）若他能当天卖完，请问他能赚多少钱？名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 5 页，共 8 页 - - - - - - - - - relationship, establishe d equivalent relationship 14, and subject: appli cation problem (4)-scores and per centage application problem review conte

41、 nt overview answers scores, and percentage application problem of key is: according to meaning, (1) determine standard volume (units 1) (2) find associate volume rate corresponds to relationship, Then in -line sol ution. Category fraction multiplication word probl em score Division appli cations en

42、gineering pr oblem problem XV, a subject: review of the measurement of the amount of capacit y, measurement and units of measurement of common units of measurement and their significa nce i n rate 1, currency, length, area, volume, unit size, volume, weight and rate. (Omitted) 2, commonly used time

43、units and their relationships. (Slightly) with a measurement units Z hijian of of poly 1, and of method 2, and poly method 3, and of method and poly method of relationship measurement distance of method 1, and tool measurement 2, and estimates 16, and subject: geometry preliminary knowledge (1)-line

44、 and angle review content line, and segment, and Ray, and vertical, and parallel, and angle angle of classification (slightly) 17, and subject: geometry preliminary knowledge (2)-plane graphi cs review content triangle, and edges shaped, and round, and fan axisymmetric graphics perimeter and area co

45、mbination graphics of area subject : Preliminary knowledge (3)-review of solid content category 1-d shapes are divided into: cylinder and cone 2, column is divi ded into: cuboid, square 3, cone cone of the features of cuboids and cubes relationship between characteristics of circular cone is slightl

46、y solid surfa ce area and volume 1, size 2, table .和参考答案 1 一、 18 ADCBBCCA 二、 1 （）10 x； 2；4912；112；。；25；227；，；三、（）28x； （）1x； （）5x； （）2y ；不是（提示：因为2x是方程40ax的解，所以240a，解之得2a将2a代入方程2534axxa，得4538xx，将3x代入该方程左边，则左边 =7，代入右边，则右边=1，左边右边，所以3x不是方程4538xx的解 ）20087（提示：由已知236mxm是关于x的一元一次方程，得231m，解得2m 将2m代 入 原 方 程 可

47、化 为62x， 解 之 得4x 所 以 代 数 式200820082008(3)( 43)7x ） 129 （提示： 由3346xyz得，393xx，；3124yy，；3186zz， 所以3463( 9)4 126 182748108129xyz ）四、102mx，（提示：将两个方程分别化为用m表示x的方程，得12xm和21xm因为它们的解相同，所以1221mm，解得12m将12m代入12xm或者21xm，得0 x ）解：设36mn，解方程3623xx，移项，得3236xx，解得3x答案不唯一，只要符合要求即可参考答案 2：一、 1、D 2 、C 3 、C 4 、 A 5、C 6 、D 7 、

48、 D 8 、B二、 9、 （1） 7x-4 (2) 2y+12 10、x=-6 11、k=4 12、x=13/8 13、0.4 14 、m=16 15、x+(x-2)+(x-4)=18 16、11+2x, 31-2x, 5 三、17、 （1）x=-2（ 2）y=44 (3) x = -9 ；(4) x=2.5 18、设儿子今年x 岁，则 :4x+x=50,解得： x=10 19、 设现在有 x 船，则有 9(x-1) 名同学 , 则： 9(x-1)=6(x+1),解得： x=5 此时基电路9(x- 1)=94=36 所以这个班有36 名同学。20、爷爷赢了9 盘，孙子赢了3 盘 21 、甲工作

49、了6 天。四、 22、(1) 设若相向而行，出发后x 小时相遇，则：80 x+120 x=600 解得， x=3 (2) 设若两车相背而行， x 小时后两车相遇800 千米，则： 80 x+120 x=600 +800 解得， x=7 （3）设若两车同向而行，快车在慢车后面，x 小时后快车追上慢车，则： 120 x=80 x+600 解得， x=15 （ 4） 设 若 两 车 同 向 而 行 ， 慢 车 在 快 车 后 面 ， x 小 时 后 两 车 相 距760 千 米 ， 则 ：120 x+600=80 x+760 解得， x=4 23 （1）第二个排球；（2）如果 pq，则结果为q 的质

50、量好一些；如果 p q，则结果为p 的质量好一些；如果 p=q，则两个排球的质量一样好。名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 6 页，共 8 页 - - - - - - - - - relationship, establishe d equivalent relationship 14, and subject: appli cation problem (4)-scores and per centage application problem review conte