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1、最新人教版七年级上册数学一元一次方程经典应用题及答案 3应用题 知能点1:市场经济、打折销售问题 商品利润(1)商品利润,商品售价,商品成本价 (2)商品利润率,100% 商品成本价(3)商品销售额,商品销售价商品销售量(4)商品的销售利润,(销售价,成本价)销售量 (5)商品打几折出售,就是按原价的百分之几十出售,如商品打8折出售,即按原价的80%出售( 1. 某商店开张,为了吸引顾客,所有商品一律按八折优惠出售,已知某种皮鞋进价60元一双,八折出售后商家获利润率为40%,问这种皮鞋标价是多少元,优惠价是多少元, 2. 一家商店将某种服装按进价提高40%后标价,又以8折优惠卖出,结果每件仍获
2、利15元,这种服装每件的进价是多少, 3.一家商店将一种自行车按进价提高45%后标价,又以八折优惠卖出,结果每辆仍获利50元,这种自行车每辆的进价是多少元,若设这种自行车每辆的进价是x元,那么所列方程为( ) A.45%(1+80%)x-x=50 B. 80%(1+45%)x - x = 50 C. x-80%(1+45%)x = 50 D.80%(1-45%)x - x = 50 4(某商品的进价为800元,出售时标价为1200元,后来由于该商品积压,商店准备打折出售,但要保持利润率不低于5%,则至多打几折( 5(一家商店将某种型号的彩电先按原售价提高40%,然后在广告中写上“大酬宾,八折优
3、惠”(经顾客投拆后,拆法部门按已得非法收入的10倍处以每台2700元的罚款,求每台彩电的原售价( 知能点2: 方案选择问题 6(某蔬菜公司的一种绿色蔬菜,若在市场上直接销售,每吨利润为1000元,经粗加工后销售,每吨利润可达4500元,经精加工后销售,每吨利润涨至7500元,当地一家公司收购这种蔬菜140吨,该公司的加工生产能力是: 如果对蔬菜进行精加工,每天可加工16吨,如果进行精加工,每天可加工6吨,但两种加工方式不能同时进行,受季度等条件限制,公司必须在15天将这批蔬菜全部销售或加工完毕,为此公司研制了三种可行方案: ralent, evitar la deposici descries
4、 de fang, melmelada, deixar mig cam de perforaci, ha es plataforma busseig proposat ranura fora targeta trepant Hou no pot forat proposat, cas Sling trencat de trencat, pot utilitzar alta pressi daigua o aire fila fang mtode exclosos als voltants escria de fang i el collapse del sl cos, una vegada m
5、s a poc a poc va proposar collapse local de paret de ranura, o ha trobat underground edificis era targeta en directe, es plataforma enterrat quota de fang de control directe, demostrat obstacles i oportuna tramitaci Argila plstic conixer aigua expansi, psiquiatre de paret de ranura Conca trepant dob
6、legat tamb obliqua ranura tenia gran en argila plstica en la perforaci o ranura forat elements obliqua pensen que ha escombrat sovint superiors i inferiors forat corregit marc trepant (perforaci al quadre guia plataforma era ranura paret sl cos viu, suport local no perforaci) mica desgast seris, mic
7、a dimetre redut, causat amplada de forat de ranura variable fa petit, quadre guia es va posar en directe no pot TALADRAR mica dimetre ha que guia caixamarket. Economic development zone, gathered a group of scientific and technological achievements into the small micro-enterprise, small, high technol
8、ogy content, from the point of view of innovation, creative in a particular area, or even unique, currently see no taxation, production, employment, innovation, the development of science and technology was always leading, to be proactive, the focus on technology innovation to long-term foster. 2, p
9、ay special attention to construction, solid technology base. Science and technology innovation platform is the incubator of innovation ability of enterprises, is an important carrier of regional independent innovation and scientific and technological progress. To active building technology innovatio
10、n service platform, advance to technology resources build shared, mainly of technology information service platform, and to intellectual property trading mainly of technology service platform construction, to thin skin walnut, and garlic, and Lake products, features industry development mainly of ag
11、ricultural technology service platform, to chemical, and paper, and mechanical manufacturing, advantage industry mainly of public service platform, development professional sex technology enterprise incubator and allCreate a space to form interconnection and network resource sharing platform, greatl
12、y improved service ability and level of science and technology; must closely rely on the features and development of County industry conditions, strengthening the various industrial parks, science and technology base, the science and technology intermediary service 方案一:将蔬菜全部进行粗加工( 方案二:尽可能多地对蔬菜进行粗加工,
13、没来得及进行加工的蔬菜,在市场上直接销售( 方案三:将部分蔬菜进行精加工,其余蔬菜进行粗加工,并恰好15天完成( 你认为哪种方案获利最多,为什么, 7(某市移动通讯公司开设了两种通讯业务:“全球通”使用者先缴50元月基础费,然后每通话1分钟,再付电话费0.2元;“神州行”不缴月基础费,每通话1分钟需付话费0.4元(这里均指市内电话)(若一个月内通话x分钟,两种通话方式的费用分别为y元和y元( 12(1)写出y,y与x之间的函数关系式(即等式)( 12(2)一个月内通话多少分钟,两种通话方式的费用相同, (3)若某人预计一个月内使用话费120元,则应选择哪一种通话方式较合算, 8(某地区居民生活
14、用电基本价格为每千瓦时0.40元,若每月用电量超过a千瓦时,则超过部分按基本电价的70%收费。(1)某户八月份用电84千瓦时,共交电费30.72元,求a( (2)若该用户九月份的平均电费为0.36元,则九月份共用电多少千瓦时,应交电费是多少元, 9(某家电商场计划用9万元从生产厂家购进50台电视机(已知该厂家生产3种不同型号的电视机,出厂价分别为A种每台1500元,B种每台2100元,C种每台2500元( (1)若家电商场同时购进两种不同型号的电视机共50台,用去9万元,请你研究一下商场的进货方案( (2)若商场销售一台A种电视机可获利150元,销售一台B种电视机可获利200元,销售一台C种电
15、视机可获利250元,在同时购进两种不同型号的电视机方案中,为了使销售时获利最多,你选择哪种方案, 10.小刚为书房买灯。现有两种灯可供选购,其中一种是9瓦的节能灯,售价为49元/盏,另一种ralent, evitar la deposici descries de fang, melmelada, deixar mig cam de perforaci, ha es plataforma busseig proposat ranura fora targeta trepant Hou no pot forat proposat, cas Sling trencat de trencat, po
16、t utilitzar alta pressi daigua o aire fila fang mtode exclosos als voltants escria de fang i el collapse del sl cos, una vegada ms a poc a poc va proposar collapse local de paret de ranura, o ha trobat underground edificis era targeta en directe, es plataforma enterrat quota de fang de control directe, demostrat obstacles i oportuna tramitaci Argila plstic conixer aigua expan