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人教版新课标小学数学四年级下册统计说课稿2篇

  • 新人教版高中英语选修2Unit 5 Using langauge-Listening教学设计

    新人教版高中英语选修2Unit 5 Using langauge-Listening教学设计

    The theme of this section is to learn how to make emergency calls. Students should learn how to make emergency calls not only in China, but also in foreign countries in English, so that they can be prepared for future situations outside the home.The emergency telephone number is a vital hotline, which should be the most clear, rapid and effective communication with the acute operator.This section helps students to understand the emergency calls in some countries and the precautions for making emergency calls. Through the study of this section, students can accumulate common expressions and sentence patterns in this context. 1.Help students accumulate emergency telephone numbers in different countries and learn more about first aid2.Guide the students to understand the contents and instructions of the telephone, grasp the characteristics of the emergency telephone and the requirements of the emergency telephone.3.Guide students to understand the first aid instructions of the operators.4.Enable Ss to make simulated emergency calls with their partners in the language they have learned1. Instruct students to grasp the key information and important details of the dialogue.2. Instruct students to conduct a similar talk on the relevant topic.Step1:Look and discuss:Match the pictures below to the medical emergencies, and then discuss the questions in groups.

  • 新人教版高中英语选修2Unit 4 Learning about Language教学设计

    新人教版高中英语选修2Unit 4 Learning about Language教学设计

    This section guides students to pay attention to the typical context of vocabulary use, helps students accumulate vocabulary around the key vocabulary of this unit, and uses the learned words and word chunks in different contexts to deeply understand their meaning and usage, so as to achieve the purpose of review and consolidation.The teaching design activities aim to guide students to pay attention to the typical context in which the target vocabulary is used, as well as the common vocabulary used in collocation, so that students can complete the sentence with correct words. In terms of vocabulary learning strategies, this unit focuses on cultivating students' ability to pay attention to collocation of words and to use word blocks to express meaning.For vocabulary learning, it is not enough just to know the meaning of a single word, but the most important thing is to master the common collocations of words, namely word blocks.Teachers should timely guide students to summarize common vocabulary collocation, such as verb and noun collocation, verb and preposition collocation, preposition and noun collocation, and so on.1. Guide students to understand and consolidate the meaning and usage of the vocabulary in the context, 2. Guide the students to use the unit topic vocabulary in a richer context3. Let the students sort out and accumulate the accumulated vocabulary, establishes the semantic connection between the vocabulary,4. Enable students to understand and master the vocabulary more effectivelyGuiding the Ss to use unit topic words and the sentence patterns in a richer context.

  • 统编版三年级语文上第14课小狗学叫

    统编版三年级语文上第14课小狗学叫

    《小狗学叫》这篇童话通过拟人的手法,叙述的是一只小狗学叫的故事。构思新颖,想象丰富,作者的情思寄寓在形象的描写中,耐人寻味。故事读起来看似有点荒诞无稽,但细品之后谁也不会去怀疑和谈论故事的真实性,而是深刻地思考品评故事所暗示的“小狗终于做成真正的狗,找回迷失的自我”的主题。作者曾经说过:“在每一件事物中都有一个故事,这些故事在桌子的木头中,在玻璃中,在玫瑰中……” 《小狗学叫》正是以现实生活为基础,在每一件事中挖掘故事,把现实世界的偶然现象和必然因素统一起来,把故事情节的曲折变化和人物性格的逻辑发展结合起来,通过这一高超的艺术辩证法,幽默地展示出现实社会中的某些现象,使人们在笑声中受到教育和启发。我们可用多媒体课件等形象的教学手段,拉近学生与文本之间的距离。 1.会认“讨、厌”等11个生字,读准“吗、担”等5个多音字。2.能预测故事的结局,并将自己的预测与原文进行比较,体会预测的多样性,培养学生听故事的技巧和预测故事结局的能力。3.通过分角色朗读,在观察、想象、表演中,让学生感受阅读的乐趣。4.引导学生正确认识自我,发现自己的潜力,能够做好自己。 1.教学重点:培养学生听故事的技巧和预测故事结局的能力,能根据故事发展寻找推测故事结局的依据。2.教学难点:培养学生认真思考、仔细推敲的探究习惯。 1课时

  • 统编版二年级语文上识字2树之歌教学设计教案

    统编版二年级语文上识字2树之歌教学设计教案

    《树之歌》是统编版二年级上册第二单元的一篇识字课文。介绍树木特征的归类识字歌,描写了杨树、榕树、梧桐树……等11种树木,表现了大自然树木种类的丰富。课文安排了一组“木”字旁归类识字。把树木的名称集中在一首诗歌中,让学生在感受美丽景色、感受美好生活的同时,认识事物,认识表示树木的汉字,感知不同树木的名称。教学的过程中可引导学生在诵读文本的同时,体现多样的识字形式,要将识字教学与阅读文本有机融合, 在反复的读书体会中,引导学生发现汉字规律,运用形声字形旁表义、声旁表音的特点归类识字,并鼓励学生运用已经掌握的方法自主识字。 1.认识“梧、桐”等15个生字,会写“杨、壮”等10个生字。学会运用形声字的特点自主识字。2.正确、流利地朗读儿歌,并背诵全文。3.通过看图和读儿歌,初步了解11种树木的基本特点。积累与树木有关的语句。4.引导学生学会观察身边的事物,树立爱护花草树木的意识。 1.教学重点:学会本课生字,利用形声字特点掌握木字旁的8个生字。朗读课文,背诵课文。了解不同树木的特点。2.教学难点:能按掌握形声字的构字特点,了解11种树木的基本特点。积累与树木有关的语句。能背诵课文。 2课时

  • 人教版高中数学选择性必修二导数的四则运算法则教学设计

    人教版高中数学选择性必修二导数的四则运算法则教学设计

    求函数的导数的策略(1)先区分函数的运算特点,即函数的和、差、积、商,再根据导数的运算法则求导数;(2)对于三个以上函数的积、商的导数,依次转化为“两个”函数的积、商的导数计算.跟踪训练1 求下列函数的导数:(1)y=x2+log3x; (2)y=x3·ex; (3)y=cos xx.[解] (1)y′=(x2+log3x)′=(x2)′+(log3x)′=2x+1xln 3.(2)y′=(x3·ex)′=(x3)′·ex+x3·(ex)′=3x2·ex+x3·ex=ex(x3+3x2).(3)y′=cos xx′=?cos x?′·x-cos x·?x?′x2=-x·sin x-cos xx2=-xsin x+cos xx2.跟踪训练2 求下列函数的导数(1)y=tan x; (2)y=2sin x2cos x2解析:(1)y=tan x=sin xcos x,故y′=?sin x?′cos x-?cos x?′sin x?cos x?2=cos2x+sin2xcos2x=1cos2x.(2)y=2sin x2cos x2=sin x,故y′=cos x.例5 日常生活中的饮用水通常是经过净化的,随着水的纯净度的提高,所需进化费用不断增加,已知将1t水进化到纯净度为x%所需费用(单位:元),为c(x)=5284/(100-x) (80<x<100)求进化到下列纯净度时,所需进化费用的瞬时变化率:(1) 90% ;(2) 98%解:净化费用的瞬时变化率就是净化费用函数的导数;c^' (x)=〖(5284/(100-x))〗^'=(5284^’×(100-x)-"5284 " 〖(100-x)〗^’)/〖(100-x)〗^2 =(0×(100-x)-"5284 " ×(-1))/〖(100-x)〗^2 ="5284 " /〖(100-x)〗^2

  • 人教版新目标初中英语七年级上册Good morning教案

    人教版新目标初中英语七年级上册Good morning教案

    一、知识和能力目标本单元要求学生掌握英文字母A—H,能认读其印刷体和手写体字母的大小写等四种形式。书写(大写和小写,笔顺,笔画)基本合乎要求。能看,听,说本单元所列的日常交际用语,重点学会打招呼,并做到语音语调正确。注意一些字母及日常交际用语的发音,提醒学生不要将C/si:/发成/sei:/; ?/发成/e?/,也不要将Good?H /e /等。??????'????说成/???????'???morning/二、过程和方法目标教师要尽量用英语组织教学。充分利用课堂的40分钟,不讲或少讲汉语,尽量给学生创造英语情景。教师可以用手势,表情,动作等示意,帮助学生听懂课堂用语和日常交际用语,第一次介绍某个用语时,说英语,加译文及手势,以后可酌情省去译文,最后只说英语,逐步让学生听懂。

  • 人教版新目标初中英语七年级上册Is this your pencil教案

    人教版新目标初中英语七年级上册Is this your pencil教案

    T: Please look at the pictures and learn the new words.(用多媒体展示新单词效果较好。)1.at prep. 在(里面或附近);在(点刻);2.theart.表示特指的人、物、事或群体 3.lostadj.丢失的;遗失的4.Found adj. (find的过去式、过去分词)找回的5.lost and found 失物招领6.please adv.请7.school n. 学校8.a set of一套;一副(Teach students to read the words.)2. Practice the new words. (事先录制一段短的听力,让学生通过听的训练来强化所学的新单词,并为学习写寻物启示和失物招领作好准备。)T: Please listen to a short passage twice then fill the blanks using the words we learned.(Show students a short passage and play the recording for the students to listen.)There are many things in (1)_____________________in my (2)__________. Look, here’s (3)_________keys. Is this yours? (4)__________call Jim (5)___________753-2289.Typescript:There are many things in the Lost and Found in my school. Look, here’s a set of keys. Is this yours? Please call Jim at 753-2289.

  • 人教版新目标初中英语七年级上册Do you like bananas教案

    人教版新目标初中英语七年级上册Do you like bananas教案

    教学目标 ⑴知识目标:A、学会询问对方喜欢与不喜欢的食物; B、学习并激情 些食物的词汇; C、学会谈论自己与他人早、中、晚 餐喜爱吃的食物; D、学会营养配。 ⑵能力目标:A、能准备表达喜欢和不喜欢的食物; B、能根据具体情景对话,与他人沟通信息,合作完成任务; C、通过听、说、读、写四项技能的训练,促进学生语言运用能力的提高。⑶情感目标:A、通过学习西文食品文化,促使学生了解西方生活方式与文化,培养跨 文化交际的意识; B、通过开展小组活动,指导学生积极与他人合作,培养他们的合作精神; C、通过任务型活动,使学生学会在实际生活中均衡饮食,合理配餐。 教学重点、难点 重点:A动词like一般现在时的各种句式及一般疑问句的肯定、否定回答; B关于各种食物的词汇; C名词复数的使用。 难点:一般现在时中单数第三人称的变化形式。

  • 人教版新目标初中英语七年级上册This is my sister教案

    人教版新目标初中英语七年级上册This is my sister教案

    (Play the recording twice again.) (Check the answer.) ③Pairwork. Draw your own picture and talk about it. T: We find out the picture of Lin Hai’s family. Can you draw a picture of your family? SS: … T: OK. When you finish drawing, tell your partner about your picture. You can use “This is …” and “ These are …” to talk about. Then report it to the class. (Students work.) (Check students’ work. Ask two or three students to report.) Step Three: Task. Talk about the family tree. T: Look at the family tree. I think it’s a big family. You can do it in groups of four or three. You can do it in pairs or only by yourself. Then report it to the class. (Students work. Teacher walks around in the classroom and helps the students.) T: Stop here. Let’s check it out. (Choose students to do it.) S1: Look at my family tree. This is my… This is my … They have two … This is my … This is my …This is my …This is my. My parents have two children. This is…This is my …My uncle and my aunt have a son. He is my … (Ask two more students to do it.) Homework. Write a passage about your family.

  • 人教版新目标初中英语七年级上册What color is it教案

    人教版新目标初中英语七年级上册What color is it教案

    一、知识和能力目标通过本单元教学,使学生能运用所学英语,正确地描述物体的颜色;同时进一步学习分辨人物的用语,并加以运用。二、过程和方法目标本单元口语训练应当自始至终在一种鲜明的色彩背景下进行,旨在营造那种为学生所喜爱的欢快气氛,教师应当在十种颜色上大做文章;在使用实物时要使颜色醒目;在组合图画时,要尽量用大色块;在使用投影时要使颜色突出来。教师可以从教室环境上入手营造色彩气氛,如:选取十种颜色的硬色板,剪成各个大写字母;或者将色板剪成各种卡通动物形象,悬挂在教室当中或在墙上,注明各种颜色的英语字块。三、情感态度和价值观目标用各种可以调动学生积极性的活动来提高学生的活跃性,激发他们参与讨论的热情。同时可以对学生进行美育教育,从小培养他们对美的正确认识。

  • 人教版新目标初中英语七年级上册When is your birthday教案

    人教版新目标初中英语七年级上册When is your birthday教案

    本单元主要学习名词所有格 ('s 所有格 ) 的构成和使用。在初次接触 “ 名词所有格 ” 时,学生较难理解的可能是 “ 所有格 ” 这个名称,对于它的构成,学生也许会觉得较容易。教师可通俗地告诉学生 “ 所有格 ” 的意思是表示 “…… 的 ” ,这样学生反而容易接受。在使用 “ 名词所有格 ” 形式时,学生容易犯错误或混淆的主要是:将这种一 's 构成形式与 is 的缩写形式混淆,如: My father's name's Jin Zhi .,可以这样告诉学生:名词所有格的后面一般应接名词;勿将这种一 's 结构盲目套用与人称代词上,代替物主代词使用,如 He's father's name is Li Cheng 。在教学初期,可不讲授名词所有格的其它形式,待时机成熟,再向学生介绍复数名词所有格形式的结构一 ' ,如: the students' bikes 。 Self Check 教学内容 Self Check( 教材 P52) 教学目标 知识与能力 复习词汇 birthday , date , month , January , February , March , April , May , June , July , August , September , October , November , December , date , birth , age , old , speech . contest . trip , party , event , an , festival , pop , concert , chorus , lecture , music ;引导学生复习、巩固“询问和谈论日期”的目标语言并运用所学知识安排活动。

  • 人教版新目标初中英语七年级上册Where’s my backpack教案

    人教版新目标初中英语七年级上册Where’s my backpack教案

    教师: 搜集单词卡片、背景资料。 学生:彩笔、大白纸、相关新单词。 教学设计 Step One: Learn the new words. 1.Present the new words. (Show some pictures and words on the screen to teach the students the new words.) T: What’s this? S1: It’s a room. T: Do you have a room like this? S2: Yes, I do./ No, I don’t. T: Read after me. R-O-O-M, room. Ss: R-O-O-M, room. (Teach the other words “TV, desk, picture” in the same way.) T: There are some words here. Read the words after me and spell them. (Learn the other words without pictures on the cards.) T: This is a word. Can you spell this word? (Point to a word in the card.) S1: Yes, I can. / No, I can’t. (Let them know the meaning of “can”.) T: I can spell your name. Can you spell my name? S1: Yes, I can. T: Can you write your name? S: Sorry, I can’t. I have no pen. T: You need a pen.( Give him a pen.) ( Let the students understand the word “need”.) T: I bring a football to school every day. Now it is on the floor. After class I take it to my home. (Teach “bring” and “take”. Put a football on the floor and point to the floor to teach the word “floor”.) 2.Practice the words. (Give the examples to the students and get the students to understand the new words.) Step To Listen and practice.

  • 人教版新目标初中英语八年级上册When was he born教案

    人教版新目标初中英语八年级上册When was he born教案

    1.能掌握单元的词汇,习惯用语和基本句型。2.能用who, when, how long等对句中的事件、时间、人物等提问并作相应的回答。3. 能听懂本单元学习活动中的问题,做出较得体的回答。4. 能掌握有关名人生活的动词且能熟练运用;掌握wh-特殊疑问句的运用。5. 能运用所学词汇询问名人成名的情况,学会使用一般过去时态表示过去所发生的事情。 6. 能对自己小时候会做什么事情这一话题作较具体的描述。7. 能读懂名人简介的文章。8. 能会书写名人的生活简介。9. 能在描述名人的成就时,激起自己发奋图强,努力拼搏,从而为人类的美好明天贡献自己的一份力量。10. 能根据需要进行有目的预习,使其对教师的教学内容起补充作用。11. 能利用网络上的学习资源查找信息,用所学内容进行真实的交际,积极参与课外英语学习。课时安排4课时:第一课时:Section A: 1a 1b 1c Section B: 1a 1b 3c第二课时:Section A:2a 2b 2c Section B: 2a 2b 2c Section B: 3b

  • 人教版新目标初中英语九年级上册What would you do教案

    人教版新目标初中英语九年级上册What would you do教案

    本课采用任务型教学法,用What would you do if you had a million dollars?这个问句,引出谈论假想情况的话题。 采用提问、启发和归纳的教法,让学生易于接受教材内容,培养学生的语言运用能力。 四、 教学过程设计 Step Ⅰ. Greet the whole class as usual. Step Ⅱ. Warming-up T: Do you have ten Yuan in your pocket? S1: No, I don’t. T: (Take out ten Yuan and give it to the student) OK, never mind. What would you do if it was yours? What would you do if you had ten Yuan? S1: I would buy snacks. T: OK, thank you. Sit down, please. (To the whole class) Just now, it was only ten Yuan. What about 100 Yuan? What would you doif you had 100 Yuan? S2: I’d buy a beautiful jacket. T: Thank you. (To the whole class) Now suppose you had a million dollars, what would you do? We know thatone dollar nearly equals eight Yuan, so that’s a large sum of money. Think it over carefully and tellme your ideas. What would you do if you had a million dollars? S3: I’d buy a big house. S4: I’d buy a sports car. S5: I’d put it in the bank. T: OK, stop here. Please look at the blackboard and guess what would I do if I had a million

  • 人教版高中数学选择性必修二等比数列的概念 (2) 教学设计

    人教版高中数学选择性必修二等比数列的概念 (2) 教学设计

    二、典例解析例4. 用 10 000元购买某个理财产品一年.(1)若以月利率0.400%的复利计息,12个月能获得多少利息(精确到1元)?(2)若以季度复利计息,存4个季度,则当每季度利率为多少时,按季结算的利息不少于按月结算的利息(精确到10^(-5))?分析:复利是指把前一期的利息与本金之和算作本金,再计算下一期的利息.所以若原始本金为a元,每期的利率为r ,则从第一期开始,各期的本利和a , a(1+r),a(1+r)^2…构成等比数列.解:(1)设这笔钱存 n 个月以后的本利和组成一个数列{a_n },则{a_n }是等比数列,首项a_1=10^4 (1+0.400%),公比 q=1+0.400%,所以a_12=a_1 q^11 〖=10〗^4 (1+0.400%)^12≈10 490.7.所以,12个月后的利息为10 490.7-10^4≈491(元).解:(2)设季度利率为 r ,这笔钱存 n 个季度以后的本利和组成一个数列{b_n },则{b_n }也是一个等比数列,首项 b_1=10^4 (1+r),公比为1+r,于是 b_4=10^4 (1+r)^4.

  • 人教版高中数学选择性必修二等差数列的概念(2)教学设计

    人教版高中数学选择性必修二等差数列的概念(2)教学设计

    二、典例解析例3.某公司购置了一台价值为220万元的设备,随着设备在使用过程中老化,其价值会逐年减少.经验表明,每经过一年其价值会减少d(d为正常数)万元.已知这台设备的使用年限为10年,超过10年 ,它的价值将低于购进价值的5%,设备将报废.请确定d的范围.分析:该设备使用n年后的价值构成数列{an},由题意可知,an=an-1-d (n≥2). 即:an-an-1=-d.所以{an}为公差为-d的等差数列.10年之内(含10年),该设备的价值不小于(220×5%=)11万元;10年后,该设备的价值需小于11万元.利用{an}的通项公式列不等式求解.解:设使用n年后,这台设备的价值为an万元,则可得数列{an}.由已知条件,得an=an-1-d(n≥2).所以数列{an}是一个公差为-d的等差数列.因为a1=220-d,所以an=220-d+(n-1)(-d)=220-nd. 由题意,得a10≥11,a11<11. 即:{█("220-10d≥11" @"220-11d<11" )┤解得19<d≤20.9所以,d的求值范围为19<d≤20.9

  • 人教版高中数学选择性必修二等比数列的前n项和公式   (2) 教学设计

    人教版高中数学选择性必修二等比数列的前n项和公式 (2) 教学设计

    二、典例解析例10. 如图,正方形ABCD 的边长为5cm ,取正方形ABCD 各边的中点E,F,G,H, 作第2个正方形 EFGH,然后再取正方形EFGH各边的中点I,J,K,L,作第3个正方形IJKL ,依此方法一直继续下去. (1) 求从正方形ABCD 开始,连续10个正方形的面积之和;(2) 如果这个作图过程可以一直继续下去,那么所有这些正方形的面积之和将趋近于多少?分析:可以利用数列表示各正方形的面积,根据条件可知,这是一个等比数列。解:设正方形的面积为a_1,后续各正方形的面积依次为a_2, a_(3, ) 〖…,a〗_n,…,则a_1=25,由于第k+1个正方形的顶点分别是第k个正方形各边的中点,所以a_(k+1)=〖1/2 a〗_k,因此{a_n},是以25为首项,1/2为公比的等比数列.设{a_n}的前项和为S_n(1)S_10=(25×[1-(1/2)^10 ] )/("1 " -1/2)=50×[1-(1/2)^10 ]=25575/512所以,前10个正方形的面积之和为25575/512cm^2.(2)当无限增大时,无限趋近于所有正方形的面积和

  • 人教版高中数学选择性必修二等差数列的前n项和公式(2)教学设计

    人教版高中数学选择性必修二等差数列的前n项和公式(2)教学设计

    课前小测1.思考辨析(1)若Sn为等差数列{an}的前n项和,则数列Snn也是等差数列.( )(2)若a1>0,d<0,则等差数列中所有正项之和最大.( )(3)在等差数列中,Sn是其前n项和,则有S2n-1=(2n-1)an.( )[答案] (1)√ (2)√ (3)√2.在项数为2n+1的等差数列中,所有奇数项的和为165,所有偶数项的和为150,则n等于( )A.9 B.10 C.11 D.12B [∵S奇S偶=n+1n,∴165150=n+1n.∴n=10.故选B项.]3.等差数列{an}中,S2=4,S4=9,则S6=________.15 [由S2,S4-S2,S6-S4成等差数列得2(S4-S2)=S2+(S6-S4)解得S6=15.]4.已知数列{an}的通项公式是an=2n-48,则Sn取得最小值时,n为________.23或24 [由an≤0即2n-48≤0得n≤24.∴所有负项的和最小,即n=23或24.]二、典例解析例8.某校新建一个报告厅,要求容纳800个座位,报告厅共有20排座位,从第2排起后一排都比前一排多两个座位. 问第1排应安排多少个座位?分析:将第1排到第20排的座位数依次排成一列,构成数列{an} ,设数列{an} 的前n项和为S_n。

  • 新人教版高中英语选修2Unit 2 Bridging Cultures-Discovering useful structures教学设计

    新人教版高中英语选修2Unit 2 Bridging Cultures-Discovering useful structures教学设计

    The grammar of this unit is designed to review noun clauses. Sentences that use nouns in a sentence are called noun clauses. Nominal clauses can act as subject, object, predicate, appositive and other components in compound sentences. According to the above-mentioned different grammatical functions, nominal clauses are divided into subject clause, object clause, predicate clause and appositive clause. In this unit, we will review the three kinds of nominal clauses. Appositive clauses are not required to be mastered in the optional compulsory stage, so they are not involved.1. Guide the students to judge the compound sentences and determine the composition of the clauses in the sentence.2. Instruct students to try to learn grammar by generalizing grammar rules, controlling written practice, and semi-open oral output.3. Inspire the students to systematize the function and usage of noun clause1.Instruct students to try to learn grammar by generalizing grammar rules, controlling written practice, and semi-open oral output.2.Inspire the students to systematize the function and usage of noun clauseStep1: The teacher ask studetns to find out more nominal clauses from the reading passage and udnerline the nominal clauses.

  • 人教版高中数学选修3离散型随机变量及其分布列(2)教学设计

    人教版高中数学选修3离散型随机变量及其分布列(2)教学设计

    温故知新 1.离散型随机变量的定义可能取值为有限个或可以一一列举的随机变量,我们称为离散型随机变量.通常用大写英文字母表示随机变量,例如X,Y,Z;用小写英文字母表示随机变量的取值,例如x,y,z.随机变量的特点: 试验之前可以判断其可能出现的所有值,在试验之前不可能确定取何值;可以用数字表示2、随机变量的分类①离散型随机变量:X的取值可一、一列出;②连续型随机变量:X可以取某个区间内的一切值随机变量将随机事件的结果数量化.3、古典概型:①试验中所有可能出现的基本事件只有有限个;②每个基本事件出现的可能性相等。二、探究新知探究1.抛掷一枚骰子,所得的点数X有哪些值?取每个值的概率是多少? 因为X取值范围是{1,2,3,4,5,6}而且"P(X=m)"=1/6,m=1,2,3,4,5,6.因此X分布列如下表所示

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