基础题与中考新考法·八年级·上·数学14.2.2完全方公式第1课时完全方公式(共135考：单独33考，在整式的化简求值或函数中涉及102考)教材知识知识点完全方公式35考·重点点拨·1.完全方公式22考拓展：完全方公式的探究：》拓展图①中大正方形的面积的两公式(a+b)2=a2+2ab+b2;(a-b)2=a2-2ab+b2种表示方法：S=(a+b)2,S=文字两个数的和（或差）的方，等于它们的方和a2+b2+2ab,故(a+b)2=a2+叙述加上（或减去）它们的积的2倍b2+2ab;图②中阴影部分的(m+2n)2-4)1面积的两种表示方法：S=(aa ba b-b)2,S=a2-2ab+b2,故(a-示例=m2+2·m·2n+(2n)2=y2-2y4+42Tb)2=a2-2ab+b22abb2a'2ab b2b=m'+4mn+4n2=y2-8y+162.完全方公式的常见变形B考》注意ba(1)a2+b2=(a+b)2-2ab=(a-b)2+2ab;图①图②(2)(a+b)2=(a-b)2+4ab;注意：能用完全方公式计(3)(a-b)2=(a+b)2-4ab;算的式子特点：(1)两个公(4)(a+b)2+(a-b)2=2(a2+b2):式的等号左边都是一个二项(5)(a+b)2-(a-b)2=4ab;式的方；(2)等号右边都是二次三项式，其中有两项(6b-a6)-(a-6y1-“-2:是公式等号左边二项式中每(7)(a+b+c)2=a2+b2+c2+2ab+2bc+2ac;一项的方，中间一项是等号左边二项式中两项乘积的(8)a+b+c2+ah+bc+ac=2[(a+b)+(6+c)+(a+c)2].2倍.重难题解法》答案见本册P75●利用完全方公式的变形求值8考现学活用·练1（台州中考改编）若例1（教材P112第7题改编)已知a2+b2=74,a+b=12,求(a-(2a-b)2=9,(2a+b)2=b)2的值.169,求8ab的值.引导思路a+b=12(a+b)2=a2+b2+2ab2ab=(a+b)2-(a2+b3)a2+b2=74(a-b)2=a2+b2-2ab46

(6)如书写较差以致影响交际，将分数降低一个档次。3.定档：(1)全面覆盖两个内容要点，基本达到交际目的，为及格档。(2)以此为基础，再结合其语言交际功能的实际情况、措辞、语法、句型运用等实际情况，决定其升档或降档。4.其他：(1)结合课程标准及命题要求，本次写作任务不仅考察学生的语言表达能力，特别强调语言交际能力的实现。因此学生语言表达中表明态度功能的实现需重点关注。(2)要有相应的功能性语言。(3)关于信件的体例格式，答题纸上已提供，无需关注。5.各档次的给分范围和要求：第五档(12-15分)(1)完全完成了试题规定的任务：(2)覆盖所有内容要点；(3)应用了较多的语法结构和词汇：(4)语法结构和词汇有个别错误，但为尽力使用较复杂结构或较高级词汇所致：(5)有效地使用了语句间的连接成分，使全文结构紧凑；(6)完全达到了预期的写作目的。第四档(9-11分)(1)完成了试题规定的任务：(2)虽漏掉个别次重点，但覆盖所有主要内容；(3)应用的语法结构和词汇能满足任务的要求：(4)语法结构和词汇方面应用基本准确，些许错误主要因尝试较复杂语法结构或词汇所致；(5)应用简单的语句间连接成分，使全文结构紧凑：(6)达到了基本的写作目的。第三档(6-8分)(1)基本完成了试题规定的任务：(2)虽漏掉一些内容，但覆盖所有主要内容；(3)应用的语法结构和词汇能满足任务的要求；(4)有一些语法结构和词汇的错误，但不影响理解：(5)应用简单的语句间连接成分，使全文结构连贯：(6)整体而言，基本达到了写作目的。第二档(3-5分)(1)未恰当完成试题规定的任务；(2)漏掉或未描述一些主要内容，写了一些无关内容；(3)语法结构简单，词汇知识有限：高三英语答案第5页（共7页）》

2020级秋期高三年级第二次诊断考试英语参考答案及评分意见2023.3第一部分（共20小题；每小题1.5分，满分30分）1-5 ABBCC6-10 CCAAC11-15 AACBA16-20 CBCBB第二部分（共20小题，每小题2分，满分40分）21-25 ABCCB 26-30 DBDBA 31-35 ADCDA36-40 AECGB第三部分（共20小题；每小题1.5分，满分30分）41-45.BABAC 46-50.DDACA 51-55.BCDCD56-60.ABBCD第二节（共10小题；每小题1.5分，满分15分)61.noticed62.on 63.the 64.gives 65.to dive66.was accompanied 67.previously 68.that 69.talented 70.exploration第四部分第一节短文改错（共10小题：每小题1分，满分10分）Among all the instructive proverb,the one I like best is"Where there is a way,there is aproverbswill.",who tells us that we should stick to our dreams.For me,the saying has specially meaning.whichspecialWhen I was in the Middle School,I was such poor in my studies that I nearly gave up.ThoughButmy head-teacher was always there and gave me confidence every time I lost my heart.He uses tousedsay,“A little more effort and you will make it”.Thanks to my dearest teacher,all my efforts paid back and finally I became a top student.offNothing is impossible to Awilling heart.As long as you keep try,you'll make it.trying第二节书面表达（满分25分）一、评分原则1.本题总分为25分，按5档次给分。2.评分时，先根据文章的内容和语言初步确定其所属档次，然后以该档次的要求来衡量，确定或调整档次，最后给分。英语参考答案与评分细则第1页（共2页）

33.C作者给那个旅行者买了鞋垫。34.D作者原以为他会很感激自己，然而他只问了需要付多少钱给作者。意·9·【23新教材·ZC·英语·参考答案一WYB-选择性必修第四册一QG】

全国100所名校最新高考模拟示范卷公23.C【命题意图】本题考查考生的推理判断能力。【解题分析】根据“Judging.”中的介绍可知，手稿是盲评的（仅通过机器生成的数字进行识别）。因此可推知，每篇参赛作品都会被随机安排一个号码。【阅读理解B)】本文主要介绍了l6岁的澳大利亚女孩Shalise Leesfield努力保护海洋环境的故事。24.A【命题意图】本题考查考生的推理判断能力。【解题分析】根据第1段可知，Shalise Leesfield认为灰护士鲨是非常奇妙的生物。25.B【命题意图】本题考查考生的细节理解能力。【解题分析】根据第2段第1句可知，Shalise Leesfield和议会成员合作使保护鲨鱼合法化。26.B【命题意图】本题考查考生的主旨归纳能力。【解题分析】根据第3段可知，Shalise Leesfield虽然还没有读完高中，但却取得了了不起的成就，因此本段主要介绍了Shalise Leesfield为保护环境做了大量工作。27.D【命题意图】本题考查考生的标题概括能力。【解题分析】根据全文可知，本文主要介绍了l6岁的澳大利亚女孩Shalise Leesfield努力保护海洋环境的故事。【阅读理解C】本文主要介绍了肥皂的由来、发展和现状28.D【命题意图】本题考查考生的词义推测能力【解题分析】根据第2段第2句可知，人们在试图清除羊毛中含油的污渍时，注意到将燃烧过的木头与水混合会使这一过程更容易，故process指的是“清除羊毛中含油的污渍”这一过程。29.A【命题意图】本题考查考生的推理判断能力。【解题分析】根据第2段可知，作者分别介绍了不同时间段肥皂的制造方法，即主要介绍肥皂制作的发展历程。30.D【命题意图】本题考查考生的推理判断能力。【解题分析】根据第3段第1句可知，文中提到伤寒和霍乱是为了展示肥皂在预防疾病方面的功效。31.B【命题意图】本题考查考生的推理判断能力。【解题分析】根据全文可知，本文主要介绍了肥皂的由来、发展以及它的杀菌作用，突出了肥皂在我们健康生活中的重要性。英语卷参考答案（七）第4页（共8页）【23·ZX·MNW·英语·N】

基础题与中考新考法·八年级·上·数学微专题1双角分线模型79考建议用时：20分钟教材原题改编练改编2将两条内角分线均改为外角分线如图，在△ABC中，外角∠CBD的分线与原题（教材P29第11题）如图，在△ABC中，外角∠BCE的分线相交于点P,探索∠P∠ABC和∠ACB的分线BE,CF相交于与∠A之间的数量关系。点G求证，)∠BC=1802(2AC+LAG8:(2)∠BGC=902

基础题与中考新考法·九年级·全一册·数学11.如图，在面直角坐标系x0y中，点A在x中考新考法轴负半轴上，点B在y轴正半轴上，⊙D经过13.(过程性学·定理的证明)在证明圆周A,B,0,C四点，∠AC0=角定理时，某学小组讨论出圆心与圆周120°，AB=8,则点B的坐角有三种不同的位置关系（如图①，②，标是第11题图③)，小明说：当圆心O在∠BAC的边上L》此类题解法见讲册P42时，只要利用三角形外角定理和等腰三角12.(教材P87例4改编)如图，以AB为直径形的性质即可证明；小华说：当圆心0在的⊙O经过△ABC的顶点C,AE,BE分别∠BAC的内部或外部时，可以通过添加直分∠BAC和∠ABC,AE的延长线交⊙O径这条辅助线，把问题转化为圆心0在于点D,连接BD.∠BAC的边上时的特殊情形来解决，请选(1)求证：∠BAD=∠CBD;择图②或图③中的一种完成证明，(2)求证：△BDE是等腰直角三角形：圆周角定理：一条弧所对的圆周角等于它所(3)若BC=8,DE=25,求AC的长对的圆心角的一半》此类题解法见讲册P41已知：如图，在⊙0中，BC所对的圆周角是∠BAC,圆心角是∠BOC.求证：∠BAC=2∠B0C第12题图00BBD图①图②B图③第13题图[北京、河北、贵州贵阳等地中考已考查]视频讲解缀√影中考新考法题74

般过去时，又因The term“umbrella species”与coin之间为被动关系，应用被动语态，故填was coined。59.s。考查主谓一致。根据语境可知，此处是对客观事实的描述，应用一般现在时，又因为主语是One characteristic,故填iso60.larger。考查形容词的比较级。设空处所在句使用了“the+比较级，the+比较级.”结构，表示“越…，就越…”，故填larger。61.where。考查关系副词。设空处引导限制性定语从句，修饰先行词the area,且在从句中作地点状语，故填where。62.it。考查it的用法。设空处作形式主语，句中的真实主语是that such areas will also.thatneed conservation,故填it。63.their。.考查代词。根据语境可知，此处表达的是“它们的”数量小，故填形容词性物主代词their。64.frequently。考查副词。设空处作状语，修饰move around,应用副词，故填frequently,表示“频繁地”。5.living。考查动词-ing形式。设空处与alongside pandas一起作后置定语，修饰the species,且the species与ive之间是逻辑上的主谓关系，故填living。【补充解释】home range(the last para.小：“生态”巢区（某种动物之活动范围)选做题参考答案及解析参考答案1-4 DBCA解析主题语境：人与自然一一自然生态本文是说明文。文章介绍了活跃的大屯火山群及当地的防范措施。1.D。理解具体信息。根据第二段中的These waves can be used to detect areas of liquid belowEarth's surface可知，P波和S波用来探测地表下存在液体的区域。2.B。理解具体信息。根据第四段中的The local government's Weather Bureau requested..sothat a qualified emergency warning system could be put in place和第五段中的In order to getthe necessary information可知，地震台的建立是为了收集足够的数据，更好地了解大屯火山群的岩浆室，进而更好地打造预警系统。3.C。推断。根据第四段中的so that a qualified emergency warning system could be put inplace和倒数第二段中的In20l8,the Weather Bureau was ready to establish the early warningsystem可知，当地气象局在in的团队的帮助下建立了早期预警系统，由此可推知，该部门负责为当地居民提供火山喷发预警。4.A。理解目的。最后一段说明了根据Li的预测，未来几十年发生火山喷发事件的可能性约为1%，且即使发生火山喷发，早期预警系统也能保证居民撤离到安全地带，由此可知，文章最后一段的目的是安抚大屯火山群周围的居民。

W:That's a good idea.We can have it in the parking lot of the community center.(Text 7)W:Look at the stamps.You must like collecting stamps in your spare time.M:You're right.I've collected hundreds of stamps.My mother often goes abroad and helpsme to collect stamps.I like exchanging stamps with people from foreign countries.W:Why?M:I like listening to the stories behind the stamps.Each stamp has a story to tell of differentlands and people.W:You must have made a lot of foreign friends.M:Yes.Oh,there comes the teacher.I'll tell you more about my stamps after class.W:OK.(Text 8)W:I'd like to plant some flowers and bushes in the front and back yards.I noticed the otherday that we are the only people on our street that don't have a gardenM:Well,I'm not sure.It will cost a lot of money and take a lot of time.Are you doing it justto fit in with everyone else?W:No,that's not the reason.I think their houses look nice with gardens.And I think ourswould look better,too.M:Okay.If that's how you feel,we can go down to the local garden centre and pick out somethings.What kind of flowers would you like to plant?I like yellow ones and purple ones.W:I'm not quite sure.I'd like to look at some different kinds.I love pink,so I'd want tochoose some flowers in that color.I'm determined to make our home look pretty.(Text 9)M:About your paper,the main point is to survey television,but not what's happened in thepast.W:Oh,it's a quite difficult topic.M:But the main idea must be on the future development of television.W:OK.I've read some latest articles.M:All right.What are the things that are competing with television?W:First,it's the video game.Then there is the personal computer and then the mobile phone.Last,there is the iPod.M:Which of those presents the greatest competition for television?W:According to the research,it's the first one.M:Is one of the ideas that TV programs might become shorter and shorter?W:Yes.Most people think a program might be thirty minutes long on average.I think itmight be ten minutes.M:Even less,say,four to five minutes long.·39·【23新教材·DY·英语·参考答案一WYB一必修第三册一QG】

最新中考模拟训练·英语（三）youngest ever to win the title(头衔).odpaying hess when she was5yearsdn.At that time,her parenttookHottrydifferent an,games at atraining center,.“I was attracted(吸写)引byteothchessand deeided totkeitu,”said Hou,.“Chess isa mind game full ofn(不确).Even when there are onlyfiveor six pieces left on the board,you cann predict all theKariationssaid Hou."instead of too much focuson theories,we should depend morepratice and skillsLearning methods from the past matches and practicing chess became herdaily life.It needed a lot of hard work,but it was worth it.At 13,she became China's youngesthever National Women's champion and then became the youngest chess champion in the worldat 16.Although she became a famous chess star known all over the world,Hou wasn't proud量of it."I'm happy to win these titles,but I know this is a coin with two sides,"Hou added."As you gain public attention,your faults will become larger.So I should keep improving."Having focused on international chess for a long time,Hou then decided to study in the如college.In 2012,she studied International Relations at Peking University and then went tothe University of Oxford.Now,she has become a teacher at Shenzhen University.She wantsto connect the methods she learned in China and the West and teach more young Chinese people.歌58.Why did Hou Yifan decide to learn chess?A.Because her parents were good at playing chess.B.Because she was interested in it.C.Because she had a good chess teacher.长(D.Because she had no other chance to choose.59.What does the underlined word"variations"mean in Paragraph 2?(A.Changes.B.Influences.C.Mysteries.D.Players.区60.Put the things that happened to Hou in the correct order.a.She became a teacher at Shenzhen University.b.She became the youngest chess champion in the world.c.She studied International Relations at Peking University.斯d.She became China's youngest ever National Women's champion.A.b-d-a-cB.b-a-d-cC.d-b-c-aD.d-c-a-b61.What do we know about Hou?杯A.She is a hard-working chess learner.B.She is teaching at Peking University.C.She likes to bring herself to public attention.触D.She's the oldest chess champion in the world62.Where can we most probably read this text?A.In a personal diary.B.In a travel magazine.C.In a science report.D.In a news report.Words!Words!Words!may words!Weuse themtoexres feelingand ideas.Buthere dothos ordsomnnctThesthrou wide readingf published mtebydictionryhers(of Merrm WebtDend hour r two reding everyday Wht do theyper Theypay special attention to new words,new usages and differences in spellings.They also find out6which words are being used the most.And they pay attention to the way they are being used.TheOxford English Dictionarys (Ds)Reading roram uses paid andolungireaders to help.If these people bave new findings in their reading they provide examples andtheThe histery of a word)ageslo pointed outo/(21)【JX