20.一个不透明的袋中有。个正品零件和b个次品零件，从中任取一个，如果取出的是正品，则把它放回袋中：如果取出的是次品，则该次品不放回，另补一个正品放到袋中...

布形仁所以俗雨C的方程为号+y=1由当条在酸家不存在对一一1代人将圆方程得方+y-1=士号。用长1aAB1-号-(-号-区.月直线斜事为01MN=22.5w=/ABN=7Xv2X2y2=2;…店资释骑...

数学2023-2024学年人教八年级答案页第2期®学习团报第7期13.2画轴对称图形(3)平行理由：如图，连接BD和2版1.BEC,AF交BD于点G13.1.1轴对称2.解：如图，四边形A'B'C...

(2)答：CD⊥AE.因为a=31b1,而.证-(a-b小（合+）…6分…8分laP-2 1-(361)-0…9分所以CD1AE,所以CD LAE.…10分18.(12分)【解析】(1)由图可知众数为75；…2分因为0.05+0.0...

21.解：(1)因为f)=(1+)nx+1-+1血x+a+1,所以f(=-n-ax设g(x)=x一lnx一a,因为f(x)在(0，十o∞)上是增函数，所以g(x)≥0恒成立，因为g(）=1-1=1,当xC(0,1)时，g(x)<0,g...

第9章统计学生月书(2)样本相关系数r的性质当r>0时，表明成对样本数据Y=0Y=1合计X=0a6a十b当”<0时，表明成对样本数据X=1dc+d合计a十cbdn=a+b十c+d样本相关系数r的...

第十五章分式第2课时分式方程的实际应用(共242考：单独64考，结合函数或不等式（组）的实际应用178考)重难题解法》答案见本册P78●分式方程的实际应用2考现学活用...

设EF所在⊙0的半径为r,=9,.该正多边形为正九边形·直线AB与⊙0相切，..OH=r,∴.AB=2AH=20H·tan30°=233,B60XT×r1第1题解图la=180=3r,1.1BCD√3AB-6 T1,【解析】由题图...

2023届贵州省六校联盟高芳实用性联考卷（四）英语参考答案第一部分阅读理解（共两节，满分40分）第一节（共15小题；每小题2分，满分30分）1~5 BCABD6~10 CDCAA11...

Why hasn't Anna bought her plane ticket?9.题A.Because she didn't want to go out.B.Because she hasn't saved enough money.C.Because she is very busy and...

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X0123P合211030“E()=0X日+1×号+2×品+3×品=g.(13分)(3)由题意可得小明同学在一轮测试中为“优秀”的概率为P=cG(号×1-名)+C()=员，∴.小明在n轮测试中获得“优秀”的次...

ABIm-=m+m=4nm=/-4n2a、所以PA·PB=m,T·m11n因为a∈（空x).所以2a∈（π，2π），故-1≤sim2a<0.则0<-4sin2a≤4，AB所以pPA.PB=√厂1sn2a<2,当且仅当=预时，等号成立.AB...

7如图，在一个圆柱体容器内装入一些水，水面AB在圆心O下方，且AB=24©m,水的最大深度是8cm,则图中截面圆的半径为A.8 cmB.10 cmC.13 cmD.15 cm24 cm-8.如图，在R△A...

第4版听力材料写作空间1.W:Is this your watch,John?【写作练习】M:Yes,it is mine.Thank you参考听2.M:Mary,are you OK?第一步：W:No.I lost a set of keys1.pe...

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19.(本小题满分12分)元若函数fx)=2sin(ox+3)在(0，)上恰有两个零点，其中o∈N*.(1)求w的值：6(2)若fx)=5,求sin(x-12的值.20.(本小题满分12分)在△ABC中，角A,B,C所...

第6期A2版Keys:(One possible version)高频词汇I.1.reaction2.equipment3.treatment4.satisfactionⅡ.1.paid off2.try out3.got through4.from then onIIⅡ.l.clas...

三步一体高效训练讲评札记全国@0所名校单元测试示范卷·英语听力二维码第一套Unit 1 People of achievement(120分钟150分)虽微信扫码单元重难点考查非限制性定语...

36.E。根据设空处前的Shortly after in 1957,she started her career in aviation和More than65years later,,Nash continues her career in the industry可知，N...

就越意识到全球塑料污染问题的严重性。从那时起，他们就开始利用他们的平台提高人们的意识，并提倡拒绝塑料的做法。【补充解释】US Virgin Islands(para.3:美属...

理解。较少使用语句间的连接成分，内容缺少连贯性。第一档(1一5分)：未完成试题规定的任务，信息未能传达给读者明显遗漏主要内容，写了一些无关内容，原因可能是...

23.C细节理解题。对比四个旅游团的日期可知答案。24.B推理判断题。根据第一段“..I wanted one and casually mentioned it to my daughter one day...Afewweeks l...

49.What can we infer from Kevin Flynn's comments? A.People care about getting a discount most. B.People like pushing a trolley around a big warehouse....

【答案】 Last Sunday,I accompanied two of my foreign friends,Tom and Mary,around Chengdu so that they could better know the amazed city.We began with...

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C.Sometimes it requires you to rearrange your daily routine. D.More often than not,it's better to work out with a com- panion. E.So it's time to incre...

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are losing fur are almost always left outside These signs don't necessarily mean a pet has been hurt on purpose,but they shouldn't be ignored.If you s...