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2.6.1分块矩阵的乘法,准对角阵的乘积和秩 1、矩阵的分块和分块矩阵的乘法 设A是属于K上的m×n矩阵,B是K上n×k矩阵,将A的行分割r段,每段分别包含m,m2,,m,个行,又将A的列分割为s段,每段包含nn2,n个列。于是A可用
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You work for an airline you have just received a letter from a customer who says that she had a terrible flight, that her bags did not arrive until two days later, and that one of her bags was broken. Write a letter apologizing and ask for further information so that you can arrange
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Letter Writing Practice 2 Test Yourself You office needs to rent a video camera for one month. You need a small machine that produces a professional quality image. Write to Photofinish Ltd and ask them if they rent machines like that and the price. Write a full business letter. (invent any details you need)
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Lecture 10 General Introduction of Argumentative Essay Objectives To learn how a composition is different from a paragraph To learn how to write a composition generally Writing instructions The purpose of argumentation is to convince. Argumentative essays should have a debatable point, sufficient evidence, and good and clear logic
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在极限lim[1+a(x)]a(x)中,只要a(x)是无穷小,就有 lim[+a(x) ](x)=e. 这是因为,令u=,则u→∞,于是
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Content 1. summary of last article 2. exchange writing activity 3. a brief introduction of types of essays 4. Writing Is a process 5. writing is a social act 6.Task: write a story about yourself to your classmates
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准则I 如果数列{xn}{yn}及{zn}满足下列条件 (1)(n=1,2,3,) (2)lim yn=a, lim zn=a n→∞ n→∞ 那么数列{xn}的极限存在,且 lim xn=a
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1设E是直线上的一有界集,mE>0,则对任意小 于mE的正数,恒有子集E1,使m*E1=c 证明:由于E有界,故不妨令EC[a,b 令f(x)=m*(en[a,x),则f(a)0,f(b)=m*E 下证f(x)在[a,b]上连续
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外研版(三起)(2012)小学英语六年级下册Module 1 Unit 1 I want a hot dog,please.Module 1 Unit 1 I want a hot dog,please.教案(3)
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1. Listening Comprehension(每题1分,共20分) 1.c2.c3.b4.b5.c6.c7.b8.b9.c10.b11.12.a13.a14.a15.b16.d 17.d18.b19.d20.B
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