复赋范线性空间上的(I,B)-近似保正交映射

在复赋范线性空间中,给出了(I,B)-近似保正交映射的定义,运用算子论方法 ,证明了非零(I,B)-近似保正交线性映射有界并且是下有界的,并证明了在一定条件下,非零(I,B)-近似保正交线性映射是近似保B-正交线性映射。     

“补全对话”练与析

(I)A:What (1) you like?B:I'd (2) a hat.A: What (3) this blue one ?B:No, I don't like it.A:What about the yellow (4) ?B:Oh, it's a lovely hat ! (5) yousee my dress is white , and I want     

新目标英语八年级(上)Unit 7单元要点检测题(英文)

Ⅰ. 听力部分(共 25 分) 听对话, 找出与所听对话内容相符的图 片, 句子读一遍。(共 5 分) 情景反应。听句子找答语。句子读一遍。 (共 5 分) ( )6. A. I never go to school. B. I exercise every day. C. No, I don’t. ( )7. A. I study very hard every day. B. I start early every day. C. I study for three hours every day. ( )8. A. Yes, he is busy. B. No, he is healthy. C. No, he eats too much. ( )9. A. I often drink milk. B. I like to drink milk very much. C. I drink milk every day. ( )10. A. I alway…     

用初等变换求长方形矩阵的逆

已知矩阵A,求矩阵B,使得AB=I(I为单位阵)。对于A是可逆方阵时,我们已知道怎样求矩阵B;当A是nxn(m≠n)的长方形矩阵时,又怎样求B呢?本文将给出一个方法——先把A增广为可逆方阵,再用初等变换法求之。     

新目标英语八年级(上)期中测试题(英文)

(满分:100 分) Ⅰ. 听力部分(共 20 分) 情景反应。听句子找答语。句子读一遍。(5 分) ( )1. A. I like playing tennis. B. Twice a week. C. Sometimes I go shopping with my mum. ( )2. A. Because I like junk food. B. Because I’m pretty healthy. C. Because it’s bad for my health. ( )3. A. Three days a week. B. Three days. C. Three days ago. ( )4. A. You should listen to some music and relax. B. You should study hard. C. You should get stressed out. ( )5. A. That’s too bad. B. I’m sorry, I …     

新目标英语八年级(上)Unit 11单元要点检测题(英文)

Ⅰ.听力部分( 共 25 分) 听句子, 选择与所听句子意思相同或相 近的一项。句子读一遍。( 每小题 1 分, 共 5 分) ( )1. A. I like soccer best. B. I don’t like soccer. C. I have a soccer. ( )2. A. Thanks for looking after my dog. B. Thanks for your dog. C. Thanks for looking for my dog. ( )3. A. He likes English. B. He is good at English. C. He hates English. ( )4. A. I don’t have money. B. I don’t need money. C. I have nothing. ( )5. A. He is leaving Guangzhou. B. He is going to Guangzhou…     

英语Units 7-9测试题

满分: 120 分 时间: 150 分钟听力测试(20 分)I. 听力测试(20 分) 第一节 交际应答(5 分) ( ) 1. A. Jenny Black. B. I’m fine. C. Your name is Jack Smith. ( ) 2. A. I’m a doctor. B. I often study. C. I’m reading a book. ( ) 3. A. It’s a good place. B. Fantast     

一道高考试题的推广

2006年全国高考(河南卷)理科数学第12题是:设集合 I={1,2,3,4,5},选择 I 的两个非空子集 A 和 B,要使 B 中最小的数大于 A 中最大的数,则不同的选择方法共有()种.(A)50 (B)49 (C)48 (D)47本文先探究出 I 含有 n 个元素时的计数方法,然后再看上述的求解.推广设 I 是由 n 个互不相等的实数组成的集合,选择 I 的两个非空子集 A 和 B,要使A中的数小于 B 中的数,则不同的选法共有     

新目标英语九年级Unit 7单元要点检测题(英文)

Ⅰ. 听力。( 20 分) A) 听力辨图: 根据你所听到的内容,选择相对应的图 片。 (共 5 小题,每小题 1 分) 1. ( ) 2. ( ) 3. ( ) 4. ( ) 5. ( )B) 情景反应: 根据你所听到的句子,选择最佳答案。 (共 5 小题, 每小题 1 分) 6. A. He has to get lost. B. He may lose it. C. He got lost. D. He could get lost. 7. A. I think of it. B. I don’t think so. C. Yes, I do. D. No, I don’t. 8. A. Yes, of course. B. No, I think so. C. All right. I must go. D. I’m not afraid so. 9. A. Yes, you do. B. No, I am not. C.…     

新目标英语八年级(上)Unit 9单元要点检测题(英文)

I. 听力部分( 共 25 分) 听句子, 选择正确的答语。句子读一 遍。( 每小题 1 分, 共 5 分) ( )1. A. Yes, it is a boy. B. No, it isn’t a girl. C. It’s a girl. ( )2. A. I am twelve. B. For about two years. C. I studied English. ( )3. A. When I was six. B. She wa