2021年华东师大版2019-2020学年七年级下册数学第六章一元一次方程单元卷含答案.pdf
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1、华东师大版2019-2020 学年七年级下册数学第六章一元一次方程单元卷含答案一、选择题(每小题3 分,共 30 分)1.下列方程为一元一次方程的是()A.y=3 B.x+2y=3 C.x2=2x D.1y+y=22.下列变形正确的是()A.由 ac=bc,得 a=b B.由?5=?5-1,得 a=b1 C.由 2a3=a,得 a=3 D.由 2a1=3a+1,得 a=2 3.小宝今年 5 岁,妈妈35 岁,()年后,妈妈的年龄是小宝的2 倍.A.30 B.20 C.10 D.25 4.下列方程中,解为x=-2 的方程是()A.x-2=0 B.2+3x=-4 C.3x-1=2 D.4-2x=3
2、 5.在解方程2?-12=1-3-?3时,去分母后正确的是()A.3(2?-1)=1-2(3-?)B.3(2?-1)=1-(3-?)C.3(2?-1)=6-2(3-?)D.2(2?-1)=6-3(3-?)6.某商店同时卖出两件衣服,每件135 元,若按成本计,其中一件盈利25%,另一件亏损25%,那么这两件衣服卖出后,商店()A.不亏不赔 B.赚 9 元 C.赔 18 元 D.赚 18 元7.对于任意两个有理数a、b,规定 a?b=3ab,若(2x+3)?(3x1)=4,则 x 的值为()A.1 B.1 C.2 D.2 8.A 种饮料比 B 种饮料单价少1 元,小峰买了2 瓶 A 种饮料和3
3、瓶 B 种饮料,一共花了13 元,如果设A种饮料单价为x 元/瓶,那么下面所列方程正确的是A.2(x1)3x 13 B.2(x 1)3x 13 C.2x 3(x 1)13 D.2x 3(x1)13 9.根据如图所示的计算程序,若输出的值y=-1,则输入的值x为()A.2 B.-4 或 1 或-1 C.-4 或 1 D.-4 或-1 10.已知一个由50 个偶数排成的数阵用如图所示的框去框住四个数,并求出这四个数的和在下列给出备选答案中,有可能是这四个数的和的是()精品w o r d 可编辑资料-第 1 页,共 7 页-A.80 B.148 C.172 D.220 二、填空题(每小题3 分,共
4、18 分)11.已知 x=4 是关于 x 的方程 3x2a=9 的解,则a的值为 _.12.当 x=_时,4x4 与 3x10 互为相反数.13.一个两位数,十位数字是个位数字的2 倍,将两个数对调后得到的两位数比原来的两位数小36,这个两位数是 _14.一张试卷只有25 道选择题,做对一题得4 分,做错 1 题倒扣 1分,某同学做了全部试题共得85 分,他做对了 _道题15.如图,方格中的格子填上数,使得每一行、每一列以及两条对角线所填的数字之和均相等,则x 的值为_16.某客运站行车时刻表如图,若全程保持匀速行驶,则当快车出发_小时后,两车相距25km.哈尔滨 长春 出发时间 到站时间 里
5、程(km)普通车7:00 11:00 300 快车7:30 10:30 300 三、解答题(共6 题;共 52 分)17.解下列方程(1)3x+2=8-x(2)3?-13=1-4?-1618.某个商品的进价是500 元,把它提价40%后作为标价.如果商家要想保住12%的利润率搞促销活动,请你计算一下广告上可写出打几折?19.在甲处植树的学生有31 人,在乙处植树的学生有21 人,现派23 名学生到甲、乙两处支援,使得甲处植树的人数是乙处植树人数的2 倍.应往甲、乙两处各派多少名学生?20.甲乙两车从相距240 km 的两站同时开出,相对而行,甲车每小时行50km,乙车每小时行30km,问出发几
6、小时后两车相距80km?21.为庆祝建国七十周年,南岗区准备对某道路工程进行改造,若请甲工程队单独做此工程需4个月完成,若请乙工程队单独做此工程需6 个月完成,若甲、乙两队合作2 个月后,甲工程队到期撤离,则乙工程队再单独需几个月能完成?精品w o r d 可编辑资料-第 2 页,共 7 页-文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4
7、ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档
8、编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H
9、10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L
10、4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3
11、文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R
12、4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B
13、7L4 ZY3T4V8M3G322.某天,一蔬菜经营户用60元钱从蔬菜批发市场批发了萝卜和白菜共40kg到菜市场去卖,萝卜和白菜这天每千克的批发价与零售价如下表所示:品名萝卜 白菜批发价/元 1.6 1.2 零售价/元 2.5 1.8 问:他当天卖完这些萝卜和白菜共能赚多少钱?精品w o r d 可编辑资料-第 3 页,共 7 页-文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4
14、R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5
15、A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V
16、8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4
17、G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5
18、J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T
19、4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:C
20、T4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3华东师大版 2019-2020学年七年级下册数学第六章一元一次方程单元卷含答案一、选择题1.A、y=3 符合一元一次方程的定义;B、x+2y=3 含有 2 个未知数,不是一元一次方程;C、x2=2x中未知数的最高次数是2,不是一元一次方程;D、1y+y=2等号左边不是整式,不是一元一次方程,故答案为:A2.A.由 ac=bc,当 c=0 时,a 不一定等于b,错误;B.由?5=?5-1,得 a=b5,错误;C.由 2a3=a,得 a=3,正确;D.由 2a1=3a+1,得 a=2,错误.故答案为:C.3.设 x 年后,妈妈的
21、年龄是小宝的2 倍.根据题意,得2(5+x)=35+x 解得x=25 答:25 年后,妈妈的年龄是小宝的2 倍.故答案为:D.4.解:A、x-2=0,则 x=2,故 A 不符合题意;B、2+3x=-4 3x=-4-2 3x=-6 x=-2,故B符合题意;C、3x-1=2 3x=3 x=1,故 C不符合题意;D、4-2x=3-2x=-1?=12,故 D 不符合题意;故答案为:B.5.解:在解方程2?-12=1-3-?3=1 时,去分母得:3(2x-1)=6-2(3-x),故答案为:C.6.解:设盈利的衣服的进价为x元,亏损的衣服的进价为y 元,依题意,得:135-x 25%x,135-y-25%
22、y,解得:x108,y180,精品w o r d 可编辑资料-第 4 页,共 7 页-文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R
23、4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A
24、9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8
25、M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G4R4R4H10 HI5J5A9B7L4 ZY3T4V8M3G3文档编码:CT4G
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