数学2023-2024学年北师大八年级答案页第7期®1学团报第27期.∠B=∠C.AC=VAD2-CD2 =2V33~4版∠A=∠B=∠C.由(1)知，BD=2CD=4.一、选择题△ABC是等边三角形1.B2.C3.D4.C5.D6.B17.(1)证明：AB=AC,点D是:△ABD的面积-2BD~AC=2×二、填空题BC边的中点，4x2V3=4V3.7若两个三角形全等，则这两个.AD⊥BC20.(1)证明：.：AB=AC,∠B=30°，三角形一定关于某一条直线成轴对.∠BDA=90°.∠C=∠B=30°称，假CE∥AD,∠BAC=180°-30°.30°=120°.8.50°9.210.40°∴.∠BCE=∠BDA=90°·.'∠BAD=45°，11.①②③④∴.EC⊥BC..∠CAD=∠BAC-∠BAD=120°-12.20°或40°(2)60°.45°=75°，∠ADC=∠B+∠BAD=75°.三、四、.∠ADC=∠CAD13.证明：DE∥AC,18.证明：(1)AD=CD,..AC=CD.∠EDB=∠C.·.∠DAC=∠DCA.△ACD为等腰三角形.·∠E=∠ABC,∠EDB=∠C,BD=.AB∥CD,(2)解：有两种情况：①当∠ADCAC.∴.∠DCA=∠CAB90时，.·.△BDE≌△ACB(AAS).∠DAC=∠CAB.∠B=30°，.∠BAD=∠ADC.·.DE=BC..:AC是∠EAB的分线∠B=90°.30°=60°.14.解：如图，点C即为所求.CE⊥AE,CB⊥AB,②当∠CAD=90°时，∠BAD=∴.CE=BC∠BAC∠CAD=120°.90°=30°(2)由(1)知，CE=CB综上，∠BAD的度数是60°或∴.点C在线段BE的垂直分30°线上五、·.CE⊥AE,CB⊥AB,21.(1)证明：.∠B=∠AED,∠AEC=∴.∠CEA=∠CBA=90°∠B+∠BAE=∠AED+∠CED,在Rt△CEA和Rt△CBA中，∴.∠BAE=∠CED.CE=CB,CA=CA,在△ABE和△ECD中，∴.Rt△CEA≌Rt△CBA(HL)..'∠BAE=∠CED,∠B=∠C,BE=..AE=AB.CD,(第14题图).点A在线段BE的垂直分提示：连接AB,作线段AB的垂∴.△ABE≌△ECD(AAS):线上直分线EF;作∠MON的分线∴.AE=ED..AC垂直分BE,:.∠EAD=∠EDAOP,EF交OP于点C.19.(1)证明：如图，过点D作DE⊥(2)解：.∠AED=∠C-60°，AE=ED,15.解：(1)如图，点0即为所求AB于E.∴.△AED为等边三角形，作的点.∴.AE=AD=ED=4.(2)如图，点P即为所求作的点.如图，过点A作AF⊥ED于点F.AD(第19题图):∠C=90°，AD是∠BAC的分线，(第21题图)..DE=DC.在Rt△BED中，∠B=30°，EF-2ED-2.(第15题图)16.证明：D为AB边的中点，.DE-2 BD...AFVAEEF2=V4322 2V3...AD=BD.∴.BD=2DE=2CDDE⊥AC,DF⊥BC,Swem2EDAF-2×4x2V3-(2)解：：C=90°，∠B=30°，.∠AED=∠BFD=90°.∠BAC=180°-∠C-∠B=60°4V3..AD=BD,DE=DF,AD是∠BAC的分线，22.解：(1)AB=AC,∠A=40°，.:Rt△ADE≌Rt△BDF(HL).∠A=∠B.∠CAD=2∠BAC=30:ABG-LACB2180:∠A70..AB=AC..在Rt△ACD中，AD=2CD=4..MN是AB的垂直分线，第3页

1、[九师联盟]山西省2023-2024学年度高三无标题考试答案(英语)BGdyou beomeabettererevryensepoits andhe bad ones.Sometimes.evelop good habits,but herearesome ways 2、[九师联盟]山西省2023-2024学年度高三无标题考试答案(政治)全国100所名校高考冲刺卷入出300元的价格。王某与李某协商先行支付25O0元，承诺余款500元在两个月内全国100所名校高考冲刺卷人付清。李某表示同意，王某当场支付了25心元，但双方并木就后铵事宜如3、九师联盟 山西省20232024学年度高三无标题考试试题(历史)1、九师联盟 山西省20232024学年度高三无标题考试试题(地理)1、九师联盟 山西省20232024学年度高三无标题考试答案(地理)【点睛】4、九师联盟 山西省20232024学年度高三无标题考试试题(物理)1、九师联盟 山西省20232024学年度高三无标题考试答案(物理)的图像为过原点、斜率为飞的直线，则微安表©的内阻凡，(用kR表示)；(2)给微安表©并联一个定值电阻改装5、九师联盟 山西省20232024学年度高三无标题考试试题(政治)1、九师联盟 山西省20232024学年度高三无标题考试试题(地理)1、九师联盟 山西省20232024学年度高三无标题考试答案(地理)【点睛】

BGdyou beomeabettererevryensepoits andhe bad ones.Sometimes.evelop good habits,but herearesome ways that may help.Knowabou what habit you need to buldHaving good habits can help you chieve your goals more43 So think about youroadyoursef what good habit can help your goal before building a habit.Start small steps45you w habit may be important,you need to start by making a small change.Ifoudeidet46too much at first,you may not be able to keep doing it for a long time.Give yourself some timeBuilding a new habit usually 47 a long time.In other words,you must be 48enough.Some people can build a new habit in 49 than two weeks,while most of peoplewill take quite a few weeks.So when you 50 to build your new habit,just remember that itmay take some time.41.A.kickB.worryC.startD.grow42.A.cheapB.boringC.difficultD.popular43.A.seriouslyB.easilyC.carefullyD.differently44.A.die outB.break downC.show upD.come true45.A.AlthoughB.SinceC.BecauseD.After46.A.startB.changeC.tryD.touch47.A.spendsB.givesC.takesD.minds48.A.angryB.patientC.confidentD.outgoing49.A.smallerB.quickerC.moreD.less50.A.manageB.forgetC.refuseD.affordVD.补全对话（共5小题：每小题1分，满分5分）根据对话内容，从方框内的选项中选出能填入空白处的最佳选项，其中有两个为多余选项。A:Hi,Jean!Only five days to summer vacation!B:I know.51A:Me too.How do you plan to spend the vacation?B:I want to go to Dali.52A:Will you do any work there?B:No.Just relax.53A:I'll go to a seaside town.B:Then what are you going to do on vacation?A:54 You know,it's my dream to be a swimming playerB:Yours is really a great plan.55A:Thank you.Wish you a nice summer vacation!A.I can't wait!B.Have no idea!C.How about you?D.I'm going to practice swimming.E.What's the best place for vacation?F.I'm sure you'll enjoy your vacation.G.My parents and cousins will go there with me.2024年中考安徽名校大联考试卷（三)·英语试题第4页共8页

BGdyou beomeabettererevryensepoits andhe bad ones.Sometimes.evelop good habits,but herearesome ways that may help.Knowabou what habit you need to buldHaving good habits can help you chieve your goals more43 So think about youroadyoursef what good habit can help your goal before building a habit.Start small steps45you w habit may be important,you need to start by making a small change.Ifoudeidet46too much at first,you may not be able to keep doing it for a long time.Give yourself some timeBuilding a new habit usually 47 a long time.In other words,you must be 48enough.Some people can build a new habit in 49 than two weeks,while most of peoplewill take quite a few weeks.So when you 50 to build your new habit,just remember that itmay take some time.41.A.kickB.worryC.startD.grow42.A.cheapB.boringC.difficultD.popular43.A.seriouslyB.easilyC.carefullyD.differently44.A.die outB.break downC.show upD.come true45.A.AlthoughB.SinceC.BecauseD.After46.A.startB.changeC.tryD.touch47.A.spendsB.givesC.takesD.minds48.A.angryB.patientC.confidentD.outgoing49.A.smallerB.quickerC.moreD.less50.A.manageB.forgetC.refuseD.affordVD.补全对话（共5小题：每小题1分，满分5分）根据对话内容，从方框内的选项中选出能填入空白处的最佳选项，其中有两个为多余选项。A:Hi,Jean!Only five days to summer vacation!B:I know.51A:Me too.How do you plan to spend the vacation?B:I want to go to Dali.52A:Will you do any work there?B:No.Just relax.53A:I'll go to a seaside town.B:Then what are you going to do on vacation?A:54 You know,it's my dream to be a swimming playerB:Yours is really a great plan.55A:Thank you.Wish you a nice summer vacation!A.I can't wait!B.Have no idea!C.How about you?D.I'm going to practice swimming.E.What's the best place for vacation?F.I'm sure you'll enjoy your vacation.G.My parents and cousins will go there with me.2024年中考安徽名校大联考试卷（三)·英语试题第4页共8页

1、[九师联盟]山西省2023-2024学年度高三无标题考试答案(物理)1、九师联盟 山西省20232024学年度高三无标题考试答案(物理)的图像为过原点、斜率为飞的直线，则微安表©的内阻凡，(用kR表示)；(2)给微安表©并联一个定值电阻改装2、九师联盟 山西省20232024学年度高三无标题考试试题(物理)1、九师联盟 山西省20232024学年度高三无标题考试答案(物理)的图像为过原点、斜率为飞的直线，则微安表©的内阻凡，(用kR表示)；(2)给微安表©并联一个定值电阻改装3、九师联盟 山西省20232024学年度高三无标题考试答案(物理)的图像为过原点、斜率为飞的直线，则微安表©的内阻凡，(用kR表示)；(2)给微安表©并联一个定值电阻改装成量程为01mA的电流表，用标准电流表0与串联进行校准。当标准电流表0的示数为051mA时，微安

1、九师联盟 山西省20232024学年度高三无标题考试答案(物理)的图像为过原点、斜率为飞的直线，则微安表©的内阻凡，(用kR表示)；(2)给微安表©并联一个定值电阻改装成量程为01mA的电流表，用标准电流表0与串联进行校准。当标准电流表0的示数为051mA时，微安2、九师联盟 山西省20232024学年度高三无标题考试试题(物理)1、九师联盟 山西省20232024学年度高三无标题考试答案(物理)的图像为过原点、斜率为飞的直线，则微安表©的内阻凡，(用kR表示)；(2)给微安表©并联一个定值电阻改装

1、[九师联盟]山西省2023-2024学年度高三无标题考试试题(生物)1、[九师联盟]山西省2023-2024学年度高三无标题考试答案(历史)1、[九师联盟]山西省2023-2024学年度高三无标题考试答案(地理)2、九师联盟 山西省20232024学年度高三无标题考试试题(英语)B.Profer giving ture nC.An old oueistingbarweekends.D.Youngrydet26.Whatisthedirectreasonfortheappear3、九师联盟 山西省20232024学年度高三无标题考试试题(物理)1、九师联盟 山西省20232024学年度高三无标题考试答案(物理)的图像为过原点、斜率为飞的直线，则微安表©的内阻凡，(用kR表示)；(2)给微安表©并联一个定值电阻改装4、九师联盟 山西省20232024学年度高三无标题考试答案(历史)-5、九师联盟 山西省20232024学年度高三无标题考试答案(生物)D.不考虑互换，让F1中野生型个体间随机交配，则后代中易位纯合子占1/48.某研究小组研究油菜素内酯(BR)胁迫条件下脱落酸不敏感蛋白5(ABI5)缺失对拟南芥幼苗下胚轴生长的影响，将野生型拟南芥(W

1、[九师联盟]山西省2023-2024学年度高三无标题考试答案(历史)1、[九师联盟]山西省2023-2024学年度高三无标题考试答案(地理)1、九师联盟 山西省20232024学年度高三无标题考试试题(地理)

1、[九师联盟]山西省2023-2024学年度高三无标题考试答案(历史)1、[九师联盟]山西省2023-2024学年度高三无标题考试答案(地理)1、九师联盟 山西省20232024学年度高三无标题考试试题(地理)

1、[九师联盟]山西省2023-2024学年度高三无标题考试试题(历史)1、九师联盟 山西省20232024学年度高三无标题考试试题(英语)B.Profer giving ture nC.An old oueistingbarweekends.2、九师联盟 山西省20232024学年度高三无标题考试试题(化学)1、九师联盟 山西省20232024学年度高三无标题考试试题(地理)1、九师联盟 山西省20232024学年度高三无标题考试答案(地理)【点睛】3、九师联盟 山西省20232024学年度高三无标题考试试题(英语)B.Profer giving ture nC.An old oueistingbarweekends.D.Youngrydet26.Whatisthedirectreasonfortheappear4、九师联盟 山西省20232024学年度高三无标题考试试题(英语)B.Profer giving ture nC.An old oueistingbarweekends.D.Youngrydet26.Whatisthedirectreasonfortheappear5、九师联盟 山西省20232024学年度高三无标题考试答案(生物)D.不考虑互换，让F1中野生型个体间随机交配，则后代中易位纯合子占1/48.某研究小组研究油菜素内酯(BR)胁迫条件下脱落酸不敏感蛋白5(ABI5)缺失对拟南芥幼苗下胚轴生长的影响，将野生型拟南芥(W