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1、第 5 章一元一次方程一、选择题(每小题 3 分，共 24 分)1下列方程中，不是一元一次方程的是()A4x 22x B 0.1y2Cx3y 5 D 5x2x 6x2下列等式的变形，不正确的是()A若xy，则xayaB若xy，则axayC若xy，则xayaD若xy，则axay3下列方程中，解为x 2 的方程是()A2x 51xB32(x1)7xCx2 2xD1xx14144在解方程1 时，去分母正确的是()x122x33A3(x1)2(2x3)6B3(x1)2(2x3)1C2(x1)2(2x3)6D3(x1)2(2x3)35若关于x的方程 3x5x2m的解是x，则m的值为()12A2 B.C
2、D 112126若代数式x的值是 2，则x的值是()1x3A0.75 B 1.75 C 1.5 D.3.57某市为节约用水，制定了如下标准：用水不超过20 吨，按每吨1.2 元收费；超过20 吨，则超出部分按每吨1.5 元收费小明家六月份的水费是平均每吨1.25 元，那么小明家六月份应交水费()A20 元 B 24 元 C 30 元 D 36 元8如图 5 Z1，用黑白两种颜色的纸片，按黑色纸片数逐渐增加1 的规律拼成下列图案，若第n个图案中有2020 个白色纸片，则n的值为()图 5 Z1A671 B 672 C 673 D 674二、填空题(每小题 3 分，共 21 分)9若 3x2k35
3、 是一元一次方程，则k_10请构造一个一元一次方程，使得方程的解为x3：_11若 3a5b3y与 4a4x1b6是同类项，则x_，y_12如果 2x3 的值与 1x的值互为相反数，那么x_13某书店把一本新书按标价的九折出售，仍可获利20%.若该书的进价为21 元，则标价为 _14一个两位数，个位上的数字是x，十位上的数字比个位上的数字大2，且这个两位数与个位上的数字的差为50，由此列出方程为_ 15用“”定义一种新运算：对于任意实数a，b，都有ab2a3b1.例如：21 2231 1.若x(3)2，则x_三、解答题(共 55 分)16(12 分)解下列方程：(1)2x8 8x2；文档编码:C
4、L1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7
5、K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:C
6、L1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7
7、K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:C
8、L1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7
9、K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:C
10、L1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8(2)5x 3(2 x)8；(3)1.x25x1162x4317(9 分)m为何值时，代数式2m的值与代数式的值的和等于5?5m137m2文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C
11、8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9
12、HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C
13、8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9
14、HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C
15、8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9
16、HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C
17、8E818(10 分)戴口罩是抵御雾霾的无奈之举，某公司打算采购一批防雾霾口罩和滤片，已知口罩的价格为20 元/只，公司预算可以购买半箱滤片和180 只口罩；或者也可以购买3 箱滤片和100 只口罩，求每箱滤片的价格19(12 分)甲、乙两站相距240 千米，从甲站开出一列慢车，速度为每小时80 千米，从乙站开出一列快车，速度为每小时120 千米(1)若两车同时开出，背向而行，则经过多长时间两车相距540 千米？(2)若两车同时开出，同向而行(快车在后)，则经过多长时间快车可追上慢车？(3)若两车同时开出，同向而行(慢车在后)，则经过多长时间两车相距300 千米？文档编码:CL1G4K9K1O
18、9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B
19、1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O
20、9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B
21、1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O
22、9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B
23、1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O
24、9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E820(12 分)某市水果批发部门欲将A市的一批水果运往本市销售，有火车和汽车两种运输方式，运输过程中的损耗均为200 元/时，其他主要参考数据如下：运输工具途中平均速度(千米/时)运费(元/千米)装卸费用(元)火车100152000汽车8020900(1)如果选择汽车的总费用比选择火车的总费用多1100 元，那么你知道本市与A市之间的路程是多少千米吗？请你列方程解答；(2)若 A市与某市
25、之间的路程为s千米，且知道火车与汽车在路上耽误的时间分别为2小时和 3.1 小时，要想将这批水果运往该市进行销售，则当s为多少时，选择火车和汽车运输所需费用相同？文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF
26、9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E
27、8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF
28、9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E
29、8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF
30、9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E
31、8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E81C2.B 3.B4.A 5.A6D 解析 由题意可得x2，整理得3x1x6，解得x3.5.1x37C 解析 设小明家六月份用水x吨，由题意得1.2 201.5(x20)1.25x，解得x24，1.
32、25x30，所以小明家六月份应交水费30 元故选C.8C 解析 第 1 个图案中白色纸片有4 张，从第2 个图案起，每一个图案都比前一个图案多 3 张白色纸片，所以第n个图案中白色纸片的张数43(n1)(3n1)张根据题意，得3n 12020，解得n673.故选 C.9210答案不唯一，如x3 0111 212 4 解析 根据题意，得2x31x0，解得x 4.1328 元 解析 本题考查一元一次方程的应用，根据公式：100%售价进价进价利润率，可设标价为x元，则100%20%，解得x 28.0.9x21211410(x2)5015 4 解析 x(3)2，2x3(3)12，解得x 4.16解析
33、解方程时，有分母的先去分母，有括号的要去括号，再通过移项、合并同类项、两边同除以未知数的系数这几个步骤，求出未知数的值解：(1)x1.(2)去括号，得5x 63x 8，移项、合并同类项，得2x 2，两边同除以2，得x 1.(3)x.3217解：根据题意，得2m5，5m137m2文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文
34、档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T
35、2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文
36、档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T
37、2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文
38、档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T
39、2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8去分母，得12m2(5m1)3(7 m)30，去括号，得12m10m2213m 3
40、0，移项、合并同类项，得m7，两边同除以1，得m 7.18解：设每箱滤片的价格为x元，则18020 x3x10020，12解得x640.答：每箱滤片的价格为640 元19解：(1)设经过x小时两车相距540 千米，由题意得 80 x120 x540 240，解得x.32答：经过小时两车相距540 千米32(2)设经过y小时快车可追上慢车由题意得 120y80y240，解得y6.答：经过 6 小时快车可追上慢车(3)设经过z小时两车相距300 千米由题意得 120z80z300 240.解得z.32答：经过小时两车相距300 千米3220解：(1)设本市与A市之间的路程是x千米，由题意得 200
41、 20 x 900(20015x2000)1100，x80 x100解得x400.文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF
42、9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E
43、8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF
44、9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E
45、8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF
46、9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E
47、8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8答：本市与A市之间的路程是400 千米(2)选择汽车的总费用200 20s900(22.5s1520)元，选择火车的总(s803.1)费用 20015s2000(17s2400)元，(s1002)令 22.5s152017s2400，解得s160.故当s160 时，选择火车和汽
48、车运输所需总费用相同文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4
49、K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 Z
50、E9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4K9K1O9 HF9T2Z1Q7K2 ZE9F9B1C8E8文档编码:CL1G4