2020年广东中考英语专题复习二第12讲

1、第2课时,分式方程,第二章 方程与不等式,2020年广东中考复习课件,第1讲 方程与方程组,1.能够根据具体问题中的数量关系列出分式方程.,2.会解可化为一元一次方程的分式方程(方程中的分式不超,出两个).,3.能根据具体问题的实际意义，检验方程的解是否合理.,答案：C,2.(2018 年湖北荆州)解分式方程,1 x2,3,4 2x,时，去分母,可得(,),B.13(x2)4 D.13(2x)4,A.13(x2)4 C.13(2x)4 答案：B,3.(2019 年广东广州)甲、乙二人做某种机械零件，已知每 小时甲比乙少做 8 个，甲做 120 个所用的时间与乙做 150 个所 用的时间相等，设甲每小时做 x 个零件，下。

2、第二章 方程与不等式,2020年广东中考复习课件,第1课时 一元一次方程和二元一次方程组,第1讲 方程与方程组,第二章 方程与不等式,2020年广东中考复习课件,1.能够根据具体问题中的数量关系列出方程，体会方程是,刻画现实世界数量关系的有效模型.,2.经历估计方程解的过程. 3.掌握等式的基本性质. 4.会解一元一次方程.,5.掌握代入消元法和加减消元法，能解二元一次方程组. 6.能根据具体问题的实际意义，检验方程的解是否合理.,1.(2019 年四川成都)若 m1 与2 互为相反数，则 m 的值 为_. 答案：1,答案：B,3.在 x3y3 中，若用 x 表示 y，则 y_；。

3、第3课时,一元二次方程,第二章 方程与不等式,2020年广东中考复习课件,第1讲 方程与方程组,1.能够根据具体问题中的数量关系列出一元二次方程. 2.理解配方法，会用配方法、公式法、因式分解法解数字,系数的一元二次方程.,3.会用一元二次方程根的判别式判别方程是否有实根和两,个实根之间是否相等.,4.能根据具体问题的实际意义，检验方程的解是否合理.,1.关于 x 的一元二次方程(m1)x25xm23m20 的,常数项为 0，则 m(,),A.1,B.2,C.1 或 2,D.0,答案：B 2.(2018 年江苏盐城)已知一元二次方程 x2k30 有一个,根为 1，则 k 的值为(,),A.2,B.2,C.4,D.4。

4、第4 讲,二次函数,第三章 函数及其图象,2020年广东中考复习课件,1.通过对实际问题情境的分析，体会二次函数的意义. 2.会用描点法画出二次函数的图象，能通过图象了解二次,函数的性质.,3.会用配方法将数字系数的二次函数的表达式化为 ya(x h)2 k(a0)的形式，并能由此得到二次函数图象的顶点坐 标、开口方向， 画出图象的对称轴，并能解决简单实际问题.,4.会利用二次函数的图象求一元二次方程的近似解.,1.(2019 年河南)已知抛物线 yx2bx4 经过(2，n),) B.4 D.4,和(4，n)两点，则 n 的值为( A.2 C.2 答案：B,2.(2019 年内蒙古呼和浩特)二次函。

5、第3讲,二次根式,2020年广东中考复习课件,第一章 数与式,1.了解平方根、算术平方根、立方根的概念，会用根号表 示数的平方根、算术平方根、立方根. 2.了解乘方与开方互为逆运算，会用平方运算求某些非负 数的平方根，会用立方运算求百以内的整数(对应的负整数)的 立方根，会用计算器求平方根和立方根. 3.了解二次根式、最简二次根式的概念，了解二次根式(根 号下仅限于数)加、减、乘、除运算法则，会用它们进行有关实,母有理化).,答案：B,答案：C,3.(2019 年广西)若二次根式 有意义，则 x 的取值范围 是_. 答案：x4,答案：B,答案：,(续表),。

6、第12讲二次函数(一)(参考用时:35分钟)A层(基础)1.关于二次函数y=2x2+4x-1,下列说法正确的是(D)(A)图象与y轴的交点坐标为(0,1)(B)图象的对称轴在y轴的右侧(C)当x0时,y的值随x值的增大而减小(D)y的最小值为-3解析:y=2x2+4x-1=2(x+1)2-3,当x=0时,y=-1,故选项A错误;该函数的对称轴是直线x=-1,故选项B错误;当x-1时,y随x的增大而减小,故选项C错误;当x=-1时,y取得最小值,此时y=-3,故选项D正确.故选D.2.图(1)是一个横断面为抛物线形状的拱桥,当水面在l时,拱顶(拱桥洞的最高点)离水面2 m,水面宽4 m.如图(2)建立平面直角坐标系,则抛物线的表达式是(C。

7、第12讲 二次函数(一),二次函数的定义,y=ax2+bx+c,形如: (其中a,b,c是常数,且a0)的函数是二次函数.,二次函数的图象及画法,二次函数y=ax2+bx+c(a0)的图象和性质,减小,增大,增大,减小,小,大,用待定系数法求二次函数的表达式,y=a(x-h)2+k,y=a(x-x1)(x-x2),二次函数的图象与性质,例1 (2019烟台)已知二次函数y=ax2+bx+c的y与x的部分对应值如表:,下列结论:抛物线的开口向上;抛物线的对称轴为直线x=2;当00;抛物线与x轴的两个交点间的距离是4;若A(x1,2),B(x2,3)是抛物线上两点,则x1x2,其中正确的个数是( ) (A)2 (B)3 (C)4 (D)5,B,解析:由表格中数据。

8、第7讲 形容词和副词,专题二 语法知识,2020年中考复习课件,用括号内所给单词的适当形式填空 1.Most foreign visitors become _ (interest) in traditional Chinese culture than before. 2.Nowadays, English is _ (wide) used in the world because its far easier than any other language. 3.Volunteers are everywhere.You can find them _,(easy) in China.,more interested,(the) most widely,4.The soup was too _ (salt) because I put too much,salt in it.,easily,salty,healthy,5.Parents are paying more at。

9、第9讲 动词的时态和语态,专题二 语法知识,2020年中考复习课件,单项填空,C,D,(,)1.China successfully _ the World Horticultural,Exposition (世界园艺博览会) from April to October in 2019, with the topic “Green Living, Beautiful Home”.,A.hosts C.hosted,B.had host D.has hosted,(,)2.Wheres my packed lunch, mom?,In the kitchen.I _ two sandwiches for you.,A.makes,B.make,C.made,D.have made,(,)3.Its true that not every goal _ and not every,dream will come true.The most beautiful scenery is on the way.,A.achi。

10、第11讲 句子种类和成分,专题二 语法知识,2020年中考复习课件,句型转换，每空一词 1.There must be something wrong with my computer.(改为一,般疑问句),Must,anything,Dont,shout,_ there be _ wrong with your computer? 2.You shouldnt shout back to your parents while youre arguing with them! (改为祈使句) _ _ back to your parents while youre arguing with them!,3.Helen ever hardly watches TV shows.(变成反意疑问句) Helen ever hardly watches TV shows, _ _？ 4.This action movie is quite interesting, and。

11、第8讲 动词的分类,专题二 语法知识,2020年中考复习课件,单项填空,C,A,(,)1.Could I play the computer game now, mom?,No, youd better not.You _ finish your homework first.,A.might,B.could,C.must,D.can,(,)2.If you always _ yourself with others, you,may have tons of pressure. I agree.We should believe in ourselves.,A.compare,B.communicate,C.create,D.consider,(,)3.A true friend will never _ from you when,youre in trouble.,A.take away C.put off,B.run away D.get off,(,)4.Who does the schoolwork e。

12、第13讲 复合句,专题二 语法知识,2020年中考复习课件,单项填空,A,C,(,)1.What do you think of your Junior Middle School,life? I think its colorful _ I am always busy.,A.although,B.because,C.if,D.whenever,(,)2.Everyone wants to reach the top of the mountain, but,some climbers have to give it up _ it is too high.,A.while,B.unless,C.because,D.although,(,)3.If we _ take environmental problems seriously,D,B,the earth _ worse and worse. A.dont; wont be B.wont; isnt C.won。

13、第14讲 情景交际,专题二 语法知识,2020年中考复习课件,单项填空,D,C,(,)1.Would you like to come to dinner tomorrow evening?,_.,A.Yes, its true C.Its upstairs,B.You really do D.Yes, Id love to,(,)2._.Hope is all around you.,Thank you, Mr.Lin.,A.Dont be late again C.Never give up,B.Dont hurry up D.Never get proud,(,)3.I must go now.My plane is ready to take off.,Goodbye._.,A.Dont worry C.No problem,B.Have a good trip D.With pleasure,(,)4.Its nearly lunch time.How。

14、第4讲 数词,专题二 语法知识,2020年中考复习课件,用括号内所给单词的适当形式填空 1.Today is Childrens Day.Its on the _ (one) day of,June.,first,Thousands,twelfth,forties,2._ (thousand) of people come to Guilin for vacations every year. 3.I got a beautiful iPad on my _ (twelve) birthday. 4.My mother looks very young, but she is in her _,(forty).,twentieth,5.Our company lies in the _ (twenty) floor of the high building.,基数词的构成和用法,一、基数词的构成,1.112 对应的英文单词是独立单词，必须分别记忆。。

15、专题二 语法知识,第1讲 名词,2020年中考复习课件,专题二 语法知识,2020年中考复习课件,用括号内所给单词的适当形式填空 1._ (friend) are those who make you smile, always open their hearts to you and encourage you to succeed. 2.Thanks to the _ (clean), our city becomes more and,more beautiful.,Friends,cleaners,knives,3.These _ (knife) are used to cut special paper. 4.The _ (develop) of Al (人工智能) will enable us,to learn more about our brains.,development,minutes,5.The high-speed railway station is not。

16、第2讲 冠词,专题二 语法知识,2020年中考复习课件,专题二 语法知识,2020年中考复习课件,用适当的冠词(a, an, the 或/)填空 1.Dont tell a lie.You are _ honest boy. 2.Playing _ violin is fun for us all. 3.The Longest Day in Changan (长安十二时辰) is such _ wonderful TV play that I want to see it _ second,time.,an,the,a,a,4.I spend _ hour playing _ chess every day,and now Im very good at it.,an,/,the,/,5.In the United States, Fathers Day falls on _ third Sunday in _ June.,冠词是。

17、第6讲 连词,专题二 语法知识,2020年中考复习课件,选词填空 1.We cannot change reality, _ we can change the eyes,which see reality.,2.Tom can do some things at home _ he is still young. 3.I wonder if you have made a decision on the project, Jack. Not yet.I cant make it _ I have first-hand information on prices. 4.Swimming is exciting.But kids cant do it _ they go,swimming with adults.,5.I like listening to the music _ it makes me relaxed.,but,though,until,unless,because,连词是一种虚词。

18、第5讲 介词,专题二 语法知识,2020年中考复习课件,单项填空,C,D,A,(,)1.Dont stay inside _ such a sunny morning.Lets,go out for a walk.,A.at,B.in,C.on,D.to,(,)2.I won the first prize in the exam, so I was proud,_ myself.,A.about,B.over,C.from,D.of,(,)3.The “teacher-free exam” means that students take,their exams _ teachers.Students must be more honest.,A.without,B.against,C.through,D.by,(,)4.Junior high school days will be over _ a,week.How are you feeling? Im trying to keep my c。

19、第3讲 代词,专题二 语法知识,2020年中考复习课件,用括号内所给单词的适当形式填空 1.Tomorrow is Toms birthday, and he invited _ (we),to his birthday party.,us,hers,mine,themselves,2.This new e-bike is Helens, and the orange mobike is _ (she), too. 3.Who is that boy wearing a white hat? Ben, a friend of _ (I). 4.To achieve their dreams, they need to depend on _,(they).,our,5.Building beautiful China is _ (we) common dream. We must succeed.,代词是用来代替名词或名词短语的词，按其意义、特征及 语法功能分。

20、第12讲 主谓一致,专题二 语法知识,2020年中考复习课件,用括号内所给单词的适当形式填空 1.Look! Each of them _ (bring) a birthday gift for,you.,brings,needs,was,is,goes,2.Either the players or the coach _ (need) to be there to play soccer now. 3.There _ (be) a dog and two cats in the house yesterday. But they are missing. 4.Three kilometers _ (be) a farther distance.Youd better catch a bus there. 5.Everybody except Mike and Linda _ (go) to school by bus every day.,主谓一致主要掌握它的三个原则：语法一。