中考数学一元二次方程应用题经典题型汇总.pdf

promote the extension of strictly administering the party grass-roots,but also the educational practice of the mass line of the party and three-three special education results achieved further inherited and expanded.To realize two a learning education is a necessary solution to the present problems of party construction.Strengthen problem consciousness and insisted on problem-oriented,is full of strictly administering the party since the partys 18 a distinctive feature,a successful experience.Secretary Wang noted that some party members still have political awareness,lack of political responsibility issues,party awareness and consciousness of the problem belief does not really believe,slim does not actually fix problems,outspoken,and jump on the assessment of the partys policies,and so on.Bi Lifu Secretary pointed out that a quarter of the economic situation is very serious,there is pressure on environment,seasonal factors and other objective reasons,but mainly subjective problem,is the problem of party members and cadres.Some depressed,negative slack,not responsible,.Double six,one,and two took the lead,build energy burst,Hongshan district,economic prosperity,eco-livable,civilized and harmonious island.It certainly can not be separated from the whole area 646 grass-roots party organizations and 14,146 members of broad participation and support.Through the two study and education,so that every cell of the party health,every organization is strong,so that all members of the vanguard and exemplary role,all the fighting bastion role of grass-roots party organizations into full play so that we can cross the Rapids,overcome all difficulties and the smooth realization of the Thirteen-Five goal.Second,basic learning,focus on learning education must understand the learning content and learning styles Foundation learning these four words are important information inside is very large,capture profound work truth in life.For example,I often say that the good Carpenter NAO Carpenter,why do some carpenters made furniture to have everybody likes it,Carpenter we are not willing to look for him?are apparently two people high and low technology,dig into the deep is firmer when both of his apprentices are not solid,there is no good that way.Luban art of story primary school are learn had,first after six mark test practice conduct,and practice cultivation,and practice perseverance,and practice patience,then with seven days seven night mill axe theory armed,and unity action,seriously learning XI General Secretary on reform development stable,and Interior diplomatic defense,and rule party ruling army of important thought,seriously learning to XI comrade for General Secretary of Central ruling acting political new concept new thought new strategy,seriously learning XI General Secretary study in Inner Mongolia important speech spirit,Guide party members and a deep understanding of a series of important speeches rich connotation and core ideas,which began so thoroughly Marxist positionsTo sum up,is divided into 9 main parts:1.with regard to persisting and developing socialism with Chinese characteristics.18 since the XIOn more than one occasion,General Secretary of the historical origin and development process of socialism with Chinese characteristics,the road of socialism with Chinese characteristics,System Info,system,uphold and develop the understanding of socialism with Chinese characteristics is determined to have been profoundly expounded,further strengthened the party and the people adhere to and develop the confidence and determination of the socialism with Chinese characteristics.XI General Secretarys speech in this regard include the peoples yearning for a better life,that is our goal,closely focus on the development of socialism with Chinese characteristics study and publicize the spirit of party 18,the unwaveringly adhere to the development of socialism with Chinese characteristics,the persistence and good use of Mao Ze-Dongs thought of soul.2.with regard to the Chinese dream of realizing the great rejuvenation of the Chinese nation.18 closing soon,the new Central collective leadership when they visited the exhibition of the road to recovery,XI,General Secretary of the solemn declaration the great rejuvenation of the Chinese nation,the greatest dream of the Chinese nation in modern times.Zhihou,on more than one occasion,General Secretary expounded the scientific connotation of Chinese dream,realize the Chinese dream must take the road,carry forward the spirit and cohesion of Chinese forces,gradually formed the China dream,a strategic thought.And practice with the Chinese dream,reflects the history of the new session of the CPC Central Committee,and conforms to the development trend and the people hope,embodies the greatest common divisor and the consensus of Chinese people at home and abroad,inspiring all peoples forging ahead in unity,the spirit of unswervingly follow the road of socialism with Chinese characteristics flags and high melody.This aspects XI General Secretary of speech main including achieved Chinese great revival is Chinese modern yilai most great of dream in 12th session national peoples Congress first times Conference Shang of speech work to dream into really in achieved China dream of vivid practice in the flying youth dream achieved China dream not only benefit people,and benefit world people innovation due its Shi,dream suitable have its potential achieved Chinese great revival is both at home and abroad Chinese children common of dream,.3.on deepening reform.18 since the XI General Secretary for the first time to Study on the choice of the Guangdong,unequivocally express the unswervingly follow the road of reform and opening up power determination and courage.Partys 18 session adopted a decision to deepen reform,opened a new journey for deepening the reform in our country.Central has held 22 times full deepening reform led Group Conference,considered through more than 100 more items important reform programme,developed introduced more than 800 over一元二次方程应用题经典题型汇总一元二次方程应用题经典题型汇总同学们知道，学习了一元二次方程的解法以后，就会经常遇到解决与一元二次方程有关的生活中的应用问题，即列一元二次方程解应用题，不少同学遇到这类问题总是左右为难，难以下笔，事实上，同学们只要能认真地阅读题目，分析题意，并能学会分解题目，各个击破，从而找到已知的条件和未知问题，必要时可以通过画图、列表等方法来帮助我们理顺已知与未知之间的关系，找到一个或几个相等的式子，从而列出方程求解，同时还要及时地检验答案的正确性并作答.现就列一元二次方程解应用题中遇到的常见的十大典型题目，举例说明.一、增长率问题一、增长率问题例 1恒利商厦九月份的销售额为 200 万元，十月份的销售额下降了 20%，商厦从十一月份起加强管理，改善经营，使销售额稳步上升，十二月份的销售额达到了 193.6 万元，求这两个月的平均增长率.解设这两个月的平均增长率是 x.，则根据题意，得 200(120%)(1+x)2193.6，即(1+x)21.21，解这个方程，得 x10.1，x22.1（舍去）.答这两个月的平均增长率是 10%.说明这是一道正增长率问题，对于正的增长率问题，在弄清楚增长的次数和问题中每一个数据的意义，即可利用公式 m(1+x)2n 求解，其中 mn.对于负的增长率问题，若经过两次相等下降后，则有公式 m(1x)2n 即可求解，其中 mn.二、商品定价二、商品定价例 2益群精品店以每件 21 元的价格购进一批商品，该商品可以自行定价，若每件商品售价 a 元，则可卖出（35010a）件，但物价局限定每件商品的利润不得超过 20%，商店计划要盈利 400 元，需要进货多少件？每件商品应定价多少？思致超越 知行合一promote the extension of strictly administering the party grass-roots,but also the educational practice of the mass line of the party and three-three special education results achieved further inherited and expanded.To realize two a learning education is a necessary solution to the present problems of party construction.Strengthen problem consciousness and insisted on problem-oriented,is full of strictly administering the party since the partys 18 a distinctive feature,a successful experience.Secretary Wang noted that some party members still have political awareness,lack of political responsibility issues,party awareness and consciousness of the problem belief does not really believe,slim does not actually fix problems,outspoken,and jump on the assessment of the partys policies,and so on.Bi Lifu Secretary pointed out that a quarter of the economic situation is very serious,there is pressure on environment,seasonal factors and other objective reasons,but mainly subjective problem,is the problem of party members and cadres.Some depressed,negative slack,not responsible,.Double six,one,and two took the lead,build energy burst,Hongshan district,economic prosperity,eco-livable,civilized and harmonious island.It certainly can not be separated from the whole area 646 grass-roots party organizations and 14,146 members of broad participation and support.Through the two study and education,so that every cell of the party health,every organization is strong,so that all members of the vanguard and exemplary role,all the fighting bastion role of grass-roots party organizations into full play so that we can cross the Rapids,overcome all difficulties and the smooth realization of the Thirteen-Five goal.Second,basic learning,focus on learning education must understand the learning content and learning styles Foundation learning these four words are important information inside is very large,capture profound work truth in life.For example,I often say that the good Carpenter NAO Carpenter,why do some carpenters made furniture to have everybody likes it,Carpenter we are not willing to look for him?are apparently two people high and low technology,dig into the deep is firmer when both of his apprentices are not solid,there is no good that way.Luban art of story primary school are learn had,first after six mark test practice conduct,and practice cultivation,and practice perseverance,and practice patience,then with seven days seven night mill axe theory armed,and unity action,seriously learning XI General Secretary on reform development stable,and Interior diplomatic defense,and rule party ruling army of important thought,seriously learning to XI comrade for General Secretary of Central ruling acting political new concept new thought new strategy,seriously learning XI General Secretary study in Inner Mongolia important speech spirit,Guide party members and a deep understanding of a series of important speeches rich connotation and core ideas,which began so thoroughly Marxist positions To sum up,is divided into 9 main parts:1.with regard to persisting and developing socialism with Chinese characteristics.18 since the XIOn more than one occasion,General Secretary of the historical origin and development process of socialism with Chinese characteristics,the road of socialism with Chinese characteristics,System Info,system,uphold and develop the understanding of socialism with Chinese characteristics is determined to have been profoundly expounded,further strengthened the party and the people adhere to and develop the confidence and determination of the socialism with Chinese characteristics.XI General Secretarys speech in this regard include the peoples yearning for a better life,that is our goal,closely focus on the development of socialism with Chinese characteristics study and publicize the spirit of party 18,the unwaveringly adhere to the development of socialism with Chinese characteristics,the persistence and good use of Mao Ze-Dongs thought of soul.2.with regard to the Chinese dream of realizing the great rejuvenation of the Chinese nation.18 closing soon,the new Central collective leadership when they visited the exhibition of the road to recovery,XI,General Secretary of the solemn declaration the great rejuvenation of the Chinese nation,the greatest dream of the Chinese nation in modern times.Zhihou,on more than one occasion,General Secretary expounded the scientific connotation of Chinese dream,realize the Chinese dream must take the road,carry forward the spirit and cohesion of Chinese forces,gradually formed the China dream,a strategic thought.And practice with the Chinese dream,reflects the history of the new session of the CPC Central Committee,and conforms to the development trend and the people hope,embodies the greatest common divisor and the consensus of Chinese people at home and abroad,inspiring all peoples forging ahead in unity,the spirit of unswervingly follow the road of socialism with Chinese characteristics flags and high melody.This aspects XI General Secretary of speech main including achieved Chinese great revival is Chinese modern yilai most great of dream in 12th session national peoples Congress first times Conference Shang of speech work to dream into really in achieved China dream of vivid practice in the flying youth dream achieved China dream not only benefit people,and benefit world people innovation due its Shi,dream suitable have its potential achieved Chinese great revival is both at home and abroad Chinese children common of dream,.3.on deepening reform.18 since the XI General Secretary for the first time to Study on the choice of the Guangdong,unequivocally express the unswervingly follow the road of reform and opening up power determination and courage.Partys 18 session adopted a decision to deepen reform,opened a new journey for deepening the reform in our country.Central has held 22 times full deepening reform led Group Conference,considered through more than 100 more items important reform programme,developed introduced more than 800 over Page 1 of 15 让每一个学生超越老师！解根据题意，得(a21)(35010a)400，整理，得 a256a+7750，解这个方程，得 a125，a231.因为 21(1+20%)25.2，所以 a2=31 不合题意，舍去.所以 35010a3501025100（件）.答需要进货 100 件，每件商品应定价 25 元.说明商品的定价问题是商品交易中的重要问题，也是各种考试的热点.三、储蓄问题三、储蓄问题例 3王红梅同学将 1000 元压岁钱第一次按一年定期含蓄存入“少儿银行”，到期后将本金和利息取出，并将其中的 500 元捐给“希望工程”，剩余的又全部按一年定期存入，这时存款的年利率已下调到第一次存款时年利率的 90%，这样到期后，可得本金和利息共530 元，求第一次存款时的年利率.（假设不计利息税）解设第一次存款时的年利率为 x.则根据题意，得1000(1+x)500(1+0.9x)530.整理，得 90 x2+145x30.解这个方程，得 x10.02042.04%，x21.63.由于存款利率不能为负数，所以将x21.63 舍去.答第一次存款的年利率约是 2.04%.说明这里是按教育储蓄求解的，应注意不计利息税.promote the extension of strictly administering the party grass-roots,but also the educational practice of the mass line of the party and three-three special education results achieved further inherited and expanded.To realize two a learning education is a necessary solution to the present problems of party construction.Strengthen problem consciousness and insisted on problem-oriented,is full of strictly administering the party since the partys 18 a distinctive feature,a successful experience.Secretary Wang noted that some party members still have political awareness,lack of political responsibility issues,party awareness and consciousness of the problem belief does not really believe,slim does not actually fix problems,outspoken,and jump on the assessment of the partys policies,and so on.Bi Lifu Secretary pointed out that a quarter of the economic situation is very serious,there is pressure on environment,seasonal factors and other objective reasons,but mainly subjective problem,is the problem of party members and cadres.Some depressed,negative slack,not responsible,.Double six,one,and two took the lead,build energy burst,Hongshan district,economic prosperity,eco-livable,civilized and harmonious island.It certainly can not be separated from the whole area 646 grass-roots party organizations and 14,146 members of broad participation and support.Through the two study and education,so that every cell of the party health,every organization is strong,so that all members of the vanguard and exemplary role,all the fighting bastion role of grass-roots party organizations into full