苏科版七年级数学上册4.3.6打折销售问题同步练习附答案

苏科版七年级数学上册4.3.6打折销售问题同步练习附答案第6课时打折销售问题知识点 1存款利息问题1王海的爸爸想用一笔钱买年利率为2.48%的5年期国库券，他想5年后本息和为11240元，如果设应买这种国库券x元，那么可以列出方程()Ax(12.48%5)11240B5x(12.48%)11240Cx(12.48%)511240Dx2.48%5112402王大伯3年前把手头一笔钱作为3年定期存款存入银行，年利率为5%，到期后得到本息共23000元，则当年王大伯存入银行多少钱？ 知识点 2商品利润问题3一件商品的进价为80元，按标价的七折售出仍可获利5%.若标价为x元，则可列方程为()A80(15%)0.7x B800.7(15%)xC(15%)x0.7x D805%0.7x42017深圳二模一家服装店将某种服装按进价提高50%后标价，又以八折销售，售价为360元，则每件服装的进价是()A168元 B300元 C60元 D400元5阳光公司销售一种进价为21元的电子产品，按标价的九折销售，仍可获利20%，则这种电子产品的标价为()A26元 B27元 C28元 D29元6小华买了一件上衣和一条裤子，共用去306元其中上衣按标价打七折，裤子按标价打八折，上衣的标价是300元，则裤子的标价是()A160元 B150元 C120元 D100元7某商场将一款空调按标价的八折出售，仍可获利10%，若该空调的进价为2000元，则标价为_元8某电器商城五一促销，将某品牌彩电按进价提高40%，然后在广告上写“五一大酬宾，八折出售”，结果每台彩电仍获利270元，那么每台彩电进价是多少元？ 9小王去新华书店买书，书店规定花20元办优惠卡后购书可按原价的8.5折付款小王办卡后购买了一些书，购书优惠后的价格加上办卡费用比这些书的原价还少了10元钱，小王购买这些书的原价是多少？ 10某个体户同时卖出两件商品，每件售价都是1350元，按成本计算，一件盈利25%，另一件亏本25%，那么这次买卖中该个体是()A不赔不赚 B赚了90元C赚了180元 D赔了180元11.某超市推出如下优惠方案：(1)一次性购物不超过100元，不享受优惠；(2)一次性购物超过100元，但不超过300元一律9折；(3)一次性购物超过300元一律8折某人两次购物分别付款80元、252元，如果他将这两次所购商品一次性购买，那么应付款()A288元 B332元C288元或316元 D332元或363元12某校七年级社会实践小组去商场调查商品销售情况，了解到该商场以每件80元的价格购进了某品牌衬衫500件，并以每件120元的价格销售了400件，商场准备采取促销措施，将剩下的衬衫降价销售请你帮商场计算一下，每件衬衫降价多少元时，销售完这批衬衫正好达到盈利45%的预期目标？ 13购买某书有以下优惠：每本原价5元，购买20本以下的，可以打9折；购买20本和20本以上的可以打7折现有人两次共购买30本书，花费111元，两次各购买多少本书？ 14小王逛超市看到如下两个超市的促销信息： 图438(1)当一次性购物标价总额是300元时，甲、乙两家超市实付款分别是多少？(2)当标价总额是多少时，甲、乙两家超市实付款一样？(3)小王两次到乙超市购物分别付款198元和466元，若他只去一次该超市购买同样多的商品，可以节省多少元？ 详解详析1A2解：设当年王大伯存入银行x元，年利率为5%，存入3年，所以3年的利息为35%x元，3年到期后的本息共为23000元根据题意，得x35%x23000，解得x20000.答：当年王大伯存入银行20000元3A解析 根据题意建立等量关系：进价(15%)商品标价0.7，依此列方程即可4B解析 设每件服装的进价为x元，由题意得(150%)x80%360，解得x300.故每件服装的进价是300元故选B.5C解析 设这种电子产品的标价为x元由题意得0.9x212120%，解得x28，所以这种电子产品的标价为28元故选C.6C解析 设裤子的标价是x元根据题意可列方程 3000.70.8x306，解得x120，即裤子的标价是120元故选C.72750解析 设这种空调的标价为x元，根据题意可得0.8x2000200010%，解得x2750.即标价为2750元8解：设每台彩电进价是x元依题意，得0.8(140%)xx270，解得x2250.故每台彩电进价是2250元9解析 办卡费用加上打折后的书款应该等于书的原价减去节省下来的10元，由此数量关系可列方程进行解答解：设书的原价为x元由题意，得200.85xx10，解得x200.答：小王购买这些书的原价是200元10 D11C解析 (1)若第二次购物超过100元，但不超过300元，设此时所购物品价值为x元，则90%x252，解得x280，两次所购物品价值为80280360(元)300元，所以享受8折优惠，因此应付36080%288(元)(2)若第二次购物超过300元，设此时所购物品价值为y元，则80%y252，解得y315，两次所购物品价值为80315395(元)，因此应付39580%316(元)故选C.12解：设每件衬衫降价x元依题意有120400(120x)10080500(145%)，解得x20.答：每件衬衫降价20元时，销售完这批衬衫正好达到盈利45%的预期目标13解：若两次购书都没有超过20本，由题意得5300.9135(元)，不符合题意，故舍去若两次购书，有一次购书超过20本设其中一次购书x本，另一次购书(30x)本由题意得5x0.95(30x)0.7111，解得x6，30x24.综上所述，其中一次购书6本，另一次购书24本14解：(1)当一次性购物标价总额是300元时，甲超市实付款为3000.88264(元)，乙超市实付款为3000.9270(元)(2)设当标价总额是x元时，甲、乙两家超市实付款一样当一次性购物标价总额是500元时，甲超市实付款为5000.88440(元)，乙超市实付款为5000.9450(元)，440450，x500.根据题意，得0.88x5000.90.8(x500)，解得x625.答：当标价总额是625元时，甲、乙两家超市实付款一样(3)小王两次到乙超市购物分别付款198元和466元，第一次购物付款198元，购物标价可能是198元，也可能是1980.9220(元)，第二次购物付款466元，购物标价是(466450)0.8500520(元)，两次购物标价之和是198520718(元)，或220520740(元)若他只去一次该超市购买同样多的商品，实付款为5000.90.8(718500)624.4(元)，或5000.90.8(740500)642(元)，可以节省198466624.439.6(元)，或19846664222(元)答：若他只去一次该超市购买同样多的商品，可以节省39.6元或22元精编2018-2019年七年级英语上第一次月考试卷七年级 英 语 (考试时间：120分钟 总分：150分)Class: Name: Marks: 注意事项：1、答题前填写好自己的姓名、班级、考号等信息。2、请将答案正确填写在答题卡上。第卷（选择题 共85分）I. 单项选择。(A)选出可以填入空白处的最佳选项。（15小题，每题2分，共30分）( )1._ is he? He is my friend.A. What B. Where C. Who D. How( )2. Mary and Joy are _ Class One. They are _ the U.S.A.A. from; in B. in; from C. to; from D. in; to( )3. _ Yes, Im Mike.A. Whats your name? B. What are you? C. How are you? D. Are you Mike?( )4.Is this _ car? Yes, its _ English car.A. a; an B. a; a C. an; an D. an; a( )5.What are those? _ are cakes.A. These B. We C. Those D. They( )6.Whats that _ English? Its a desk.A. from B. to C. in D. /( )7. 当别人称赞你时, 你应该说: “_”。A. Thanks. B. Good. C. Yes. D. No.( )8.Is her name Sally? _A. Yes, she is. B. No, she isnt. C. Yes, its. D. No, it isnt.( )9. Im in Class 4. Are you in Class 4, _?A. either B. too C. and D. also( )10. Welcome to Beijing! _A. Welcome to Beijing, too. B. Thanks.C. Fine, thanks. D. Yes, I am.( )11. _, are you Michael? No, Im not. Im Ben.A. How are you B. OK C. Excuse me D. Thanks( )12. This is my teacher, Miss Chen. _ is from Beijing.A. She B. He C. Her D. His( )13. Linda is fifteen _.A. year B. years C. years old D. year old( )14. _ . B-O-O-K,book.A. Can you spell it, please? B.Whats this in English?B. How do you spell it? D. How are you? ( )15. What _ is Maria in? She is in _ Six.A. Class; Class B. Class; class C. class; class D. class; Class(B)选出与划线部分意思相同或相近的最佳选项。（5小题，每题1分，共5分）( )16.Whats your name? My name is Li Ming.A. You are B. I am C. I is D. She is( )17.Thank you very much. You are welcome.A. Thats OK. B. Fine, thanks. C. Nice to see you. D. Good morning( )18.How are you? Fine,thanks.A. Yes, she is. B. Goodbye! C. No,she isnt. D. Im OK.( )19.Here you are. Thanks.A. Thats OK. B. Thank. C. Thank you. D. Bye.( )20.Theyre Maria and Jane.A.They am B. They is C. They are D.You are. 完形填空。（10小题，每题1分，共10分） Hello! 21 name is Li Ying. Im twelve. Im from Kunming. Now Im in Beijing No.14 High School. Im 22 Class Five, Grade Seven. Miss Gao 23 my English teacher. She is 24 old teacher. I have(有) a pen, a ruler and two 25 in my pencil-box(文具盒). Liu Ping is in Grade Seven, too. 26 is from Guangzhou. She is my good 27 . We are in 28 same class. Now she can 29 English well(好). I think(认为) she is a good girl. Look！ 30 is that? She is Liu Ping.( )21. A. I B. My C. Your D. Me( )22. A. from B. to C. not D. in( )23. A. is B. are C. am D. be( )24. A. a B. an C. good D. /( )25. A. buses B. desks C. schoolbags D. pencils( )26. A. He B. His C. She D. Her( )27. A. friend B. teacher C. student D. mom( )28. A. these B. the C. an D. a( )29. A. spell B. speak C. help D. see( )30. A. How B. What C. Where D. Who . 阅读理解（15小题，每题2分，共30分） AName Age From TelZhong Nan 40 Beijing 8876-5342Gao Ming 13 Shanghai 5673-6981Martin 28 England 7342-6979( )31. Gao Ming is from _. A. the U.S.A. B. Japan C. China D. Canada( )32. Martin is _. A. Chinese B. Japanese C. American D. English( )33. Is Zhong Nan from China? A. No, he is. B. No, he isnt. C. Yes, he is. D. Yes, it is.( )34. How old is Zhong Nan? A. 8876-5342 B. 13 C. 28 D. 40( )35. His telephone number is 5673-6981. Who is he?A. He is Martin. B. He is Zhong Nan. C. He is Gao Ming. D. He is 40.BHello! My name is Joy. Im a girl. Im eleven. Im in Class Eight, Grade Seven. This is my friend, Joan. She is twelve. She is in a high school. She is in Class Seven, Grade Eight. My English teacher is Miss White, but her English teacher is Miss Green. Look！Whos that? Oh, shes my mom. Shes a Chinese(语文, 中文) teacher.( )36. _ is in Class Eight, Grade Seven.A. Joan B. John C. Joy D. Joe( )37. Joan is Joys _.A. teacher B. friend C. student D. mom( )38. Joan is _. A. eleven B. twelve C. thirteen D. fourteen( )39. Joys English teacher is _.A. Miss White B. Miss Green C. Joys mom D. Joan( )40. Joys mother is _.A. an English teacher B. a friendC. a student D. a Chinese teacher CHello! My name is John Brown. Im from England. Im an English teacher. Im in Beijing International School.My telephone number is 8523-3237. Zhang Hao, Alice and Yingzi are my students. Im Zhang Hao. My English name is Peter. Im eleven years old. Im from Beijing. My telephone number is 8876-5342.Alice Brown is my name. Im twelve. Im from Canada. My mom is a teacher. My telephone number is 7342-6979.Im Yingzi. Im fourteen years old. Im from Japan. 5673-6981 is my telephone number.( )41. Where is John Brown from?America B. China C. England D. Japan( )42. Peter is a .A. girl B. teacher C. mom D. student( )43. Alice is a girl. Her telephone number is .A. 5673-6981 B. 8876-5342 C. 7342-6979 D. 8523-3237( )44. How old is Yingzi?A. 11. B. 12. C. 13. D. 14.( )45.下面哪一项叙述是不正确的？A. John Brown is an English teacher. B. Zhang Hao is from China.C. Alice is a teacher. D. Yingzi is a girl student. . 补全对话。（5小题，每题2分，共10分，其中有两个选项多余）A. Welcome to China.B. Whats your telephone number?C. Are you Maria?D. Whats your name, please?E. Thats OK.F. Where are you from?G. How are you?A: Excuse me, 46. B: My name is Maria. A: 47. B: Im fro