2020年广东中考英语专题复习二第3讲

1、第三章 解答题(二)突破8分题,第3讲 解直角三角形,第二部分 专题突破,3,方法突破,4,【方法归纳】解直角三角形时，一般选取既含未知边(角)又含有已知边(或角)的直角三角形，通过锐角三角函数的定义或勾股定理，建构已知或未知之间的桥梁，从而实现求解若所求的线段(或角)不能直接求解，可以通过作出点到直线的距离或三角形高线，进而转化成直角三角形求解,5,6,7,8,【思路点拨】(1)分别在RtAPO，RtBOP中，求出AO，BO的长，从而可求得AB的长；(2)已知时间则可以根据路程公式求得其速度，将限速与其速度进行比较，若大于限速则超速，否则没有超。

2、第二章 方程与不等式,第一部分 基础过关,第3讲 一元二次方程,3,考情通览,4,5,1一元二次方程 (1)一元二次方程的概念：只含有一个未知数，并且未知数的最高次数是2的整式方程，叫做一元二次方程 (2)一元二次方程的一般形式：ax2bxc0(a，b，c是常数，且a0) (3)一元二次方程的解的概念：能使一元二次方程左右两边相等的未知数的值是一元二次方程的解,知识梳理,要点回顾,6,1.(1)若(m2)xm22mx10是关于x的一元二次方程，则m的值为_. (2)将方程x22x153x化为一般形式为_，其中a_，b_，c_. (3)已知x1是关于x的一元二次方程x2ax2b0的解，则2a4b( ) A2。

3、第二部分第三章第1讲1红星机械厂加工车间有70名工人，平均每人每天生产大齿轮10个或小齿轮20个，2个大齿轮与3个小齿轮刚好配成一套，则应安排多少人生产大齿轮，多少人生产小齿轮，才能使每天生产的大小齿轮刚好配套？解：设安排x人生产大齿轮，y人生产小齿轮，根据题意，得，解得.答：应安排40人生产大齿轮，30人生产小齿轮，才能使每天生产的大小齿轮刚好配套2(2019铜仁期末)某旅行社组织一批游客外出旅游，原计划租用30座客车若干辆，但有15人没有座位，若租用同样数量的45座客车，则多出一辆车，且其余客车恰好坐满已知30座客车租金为。

4、第三章 解答题(二)突破8分题,第1讲 实际应用题,第二部分 专题突破,3,一、分配类问题 【典例1】(2019盐城期末)某加工车间共有20名工人，现要加工1 800个甲种零件，1 000个乙种零件，已知每人每天加工甲种零件30个或乙种零件50个(每人只能加工一种零件)，怎样分工才能确保同时完成两种零件的加工任务？ 【思路分析】设安排x人生产甲种零件，y人生产乙种零件，列出二元一次方程组求解,方法突破,4,答：应安排15人生产甲种零件，5人生产乙种零件才能确保同时完成两种零件的加工任务,5,【方法归纳】解实际应用题的关键是读懂题意，弄清题中各数。

5、第二部分第三章第4讲1(2019长沙期中)为了绿化环境，某中学八年级(3)班同学都积极参加了植树活动，下面是今年3月份该班同学植树情况的扇形统计图和不完整的条形统计图：请根据以上统计图中的信息解答下列问题(1)植树3株的人数为12；(2)该班同学植树株数的中位数是2；(3)求该班同学平均植树的株数解：(1)八年级(3)班的总人数为2040%50(人)，植树3株的人数为50(102062)12(人)，故答案为12.(2)该班同学植树株数的中位数是第25、26个数据的平均数，而第25和26个数据均为2株，所以该班同学植树株数的中位数是2株(3)该班同学平均植树的株数为(101。

6、第三章 解答题(二)突破8分题,第4讲 统计与概率,第二部分 专题突破,3,一、统计 【典例1】(2019无锡)国家学生体质健康标准规定：体质测试成绩达到90.0分及以上的为优秀；达到80.0分至89.9分的为良好；达到60.0分至79.9分的为及格；59.9分及以下为不及格某校为了了解九年级学生体质健康状况，从该校九年级学生中随机抽取了10%的学生进行体质测试，测试结果如下面的统计表和扇形统计图所示,方法突破,4,各等级学生平均分统计表,5,(1)扇形统计图中“不及格”所占的百分比是_； (2)计算所抽取的学生的测试成绩的平均分； (3)若所抽取的学生中所有。

7、第一部分第三章第4讲1(2018攀枝花)抛物线yx22x2的顶点坐标为(A)A(1,1)B(1,1)C(1,3)D(1,3)2(2019荆门)抛物线yx24x4与坐标轴的交点个数为(C)A0B1C2D33(2019重庆)抛物线y3x26x2的对称轴是(C)A直线x2B直线x2C直线x1D直线x14(2019兰州)已知点A(1，y1)，B(2，y2)在抛物线y(x1)22上，则下列结论正确的是(A)A2y1y2B2y2y1Cy1y22Dy2y125(2019益阳)已知二次函数yax2bxc的图象如图所示，下列结论：ac0，b2a0，b24ac0，abc0，正确的是(A)ABCD6(2019哈尔滨)二次函数y(x6)28的最大值是8.7(2019宜宾。

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。

11、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。

12、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。

13、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。

14、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。

15、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。。

16、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。

17、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。

18、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。

19、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。

20、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。