资源描述:
《最新1入门级单元1问候及介绍ppt课件.ppt》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、1入门级单元1问候及介绍Hello;hiGoodbye.Bye.ThealphabetSpellingnamesWhat'syourfirstname?It'sPaula.What'syourlastname?It'sClark.Howdoyouspellyourname?Howdoyouspellthat?Howdoyouspellyourlastname?Thanks.Thankyou.Your'rewelcome.Numbers0-101,2,3,4,5,6,7,8,9,10Myphonenumberis503-2176.Theverb
2、bebe:am,is,areIamSally.Heisastudent.Itisnew.are-we,you,theyWearestudents.Youareastudent.Youarestudents.Theyarestudents.Theverbbe:contractionsIamSally.=I'mSally.Heisastudent.=He'sastudent.Itisnew.=It'snew.Theverbbe:contractionsWearenew.=We'renew.Youareastudent.=You'reastuden
3、t.They'restudents.AskingforphonenumberstelephonephoneAskingforphonenumbersWhat'syourtelephonenumber?What'syourphonenumber?What'syournumber?AskingforphonenumbersWhat'sMary'stelephonenumber?What'sJoe'sphonenumber?AskingforphonenumbersWhat'sJohn'stelephonenumber?It's555-6792.N
4、egativesofbebe+notNegativesofbeIamnotastudent.Heisnotbusy.Theyarenotneat.NegativecontractionswithbeI'm(Iam)notastudent.She'snotneat.We'renotteachers.NegativecontractionswithbeHeisn'tastudent.Theyaren'tnewstudents.Iamnotastudent.I'mnotastudent.Greetingsmorning,afternoon,even
5、ingGreetingsGoodmorning.Goodafternoon.Goodevening.Goodnight.GreetingsHowareyou?I'mfine,thanks.Andyou?I'mgood.Haveaniceday!(morning)QuestionswithbeIsheastudent?Aretheynew?Areyoubusy?Questionswithbeyes-noQuestionswithbeIsheastudent?Yes,heis.Isshenew?No,sheisn't.Aretheybusy?Ye
6、s,theyare.howwhatWhat'syourname?Howareyou?What'syourtelephonenumber?标准2维表问题报告人:许细清学号:080320067报告时间:8/3/2021问题描述设n是一个正整数。2×n的标准2维表是由正整数1,2,…,2n组成的2×n数组,该数组的每行从左到右递增,每列从上到下递增。2×n的标准2维表全体记为Tab(n)。问题描述例如,当n=3时Tab(3)如下:123456124356125346134256135246任务:给定正整数n,计算Tab(n)中2*n的标准2维表的个
7、数。在解这道题之前,我想跟大家介绍下catalan(卡特朗数),以及什么情况下的组合问题求解是卡特朗数。问题求解0(0,0)0’(0,0)A(n,n)A’(n,n)左图中,求从原点(0,0)到(n,n)点的路径数,要求中途所经过的点(a,b)满足关系a<=b;问题求解0(0,0)A(n,n)从原点(0,0)到(n,n)点,总共走2n步,我们令往X轴走一步用0表示,往Y轴走一步用1表示,则从原点(0,0)到(n,n)的一条路径对应着有n个0和n个1组成的一个组合。问题要求a<=b;问题导致求从(0,0)出发,途径对角线0A及对角线上方的点到达(
8、n,n)点的路径数。则可以途径0A上的点,但不允许穿越对角线(即对这2n个01序列,任何时候从左往右扫描,1的累计数不少于0的累计数。)问题求解0(0,0)0’(0