矩阵MK（A）及其性质

本文介绍了由一个n阶方阵A构造出一个C^kn阶矩阵Mk(A)的方法，给出了矩阵Mk(A)的一些重要性质，讨论了Mk(A)与A的关系。     

根据座钟所给时间回答问题

1.What time is it by Clock One?2.What time is it by Clock Two?3.What time is it by Clock Three?     

小樱桃漫画

瓢丽穗孰喇挂Mk弋f 属赢1二-心*71i慈1i巳7龇匠趁*[)口国0^瓠瞧,。小樱桃漫画@杨尚君 @张璋 @吴靖     

有关圆锥曲线定长弦的轨迹问题

《数学题解辞典·平面解析几何》(上海辞书出版社)题730是:过椭圆22ax2 by2=1(a>b>0)的长为2d的弦的两端点作切线,求证此两切线的交点轨迹方程为2222d(ax2 by2)=(ab2y22 ba2x22)(ax22 by22?1).本题给出了椭圆的定长弦两端点的切线交点的轨迹方程,本文先探讨双曲线、抛物线的类似结论,进而探讨定长弦中点的轨迹方程.我们把上述结论作为命题1,类似地,有命题2过双曲线22ax2?by2=1(a>0,b>0)的长为2d的弦的两端点作切线,则此两切线的交点轨迹方程为2222d(ax2?by2)=?(ab2y22 ba2x22)(ax22?by22?1).证明设弦的两端点为A(x1,y1)、B(x2,y2),过A、B…     

我们来玩数字游戏吧！

感Let，5 Play with numbers! 1德1 1 mG th6 snSW6FS n0w! It，5 time to Play with numbers! 1 knowyouknowhow! F ive times six?Thirty! Thirty divided by three?飞n! T6n Plus ten?1-w enty! Thirty minus ten?西Let，5 Play with numbe份! 1-6 1 1 me the snSWerS nOW! It，5 time to Play with numbers! 1 knowyouknowhow! F ive times four?1-w enty! IWenty divided by two?飞n! T6n Plus们ve?Fiffeen! 1-w enty minus们ve? F ifteen…again!画Let，5 Play with numbers!了德1 1 mG thG snSWe侣n0w! It’s time t…     

考考你(英文)

1A farmer has17sheep,and allbut9die.Howmany are left?Why can’t aman living in theUSA be buried inCanada?Divide30by1/2and add10.What is theanswer?Do they havea4thof July inEngland?     

英语快速问答(英文)

1.What has two legs butcannot walk? 2.How many letters arethere in "English"? 3.Which language isspoken by the most people inthe world?     

猜谜(英文)

1. What word is pronounced wrong even by the best of scholars(学者) ?2. Why are grandpa's false teeth ( 假牙)like stars?3. Why do fish live in water?     

趣味问答

1.What kind of dog nev- er bite? 2.What has teeth but cannot eat? 3.What is dark but made by light? 4.What is the best and cheapest light? 5.What do you call a wooden king?     

高中英语第三册(人教版)要点与难点指津(Units 11～13)

Unit 11Ⅰ.重点句式1.What if you feel comfortable doing a task by yourself?如果你单独干某项工作而感到舒适,又怎么办呢?     

交通方式知多少

英语中表示交通方式的方法有好几种,同学们,你们懂得哪几种呢?1.by+交通工具。表示交通工具的名词要用原形,不能用复数,也不能用代词或冠词加以修饰。如:by train(乘火车),by bus(坐公共汽车),by plane(乘飞机)等。例如:     

“traffic”方式知多少

英语中表示交通方式的方法有好几种,同学们,你们懂得哪几种呢?请看下文: 1.by 交通工具。表示交通工具的名词要用原形,不能用复数也不能加代词或冠词加以修饰。如:by train (乘火车),by bus(坐公共汽车),by plane(乘飞机),by bike(骑自行车)等。     

浅谈by+v-ing结构用法

by+v-ing结构是初三年级语法学习的重点之一.你对它了解吗?下面就让我们把焦点对准这一结构,简单谈一谈它的用法吧! [例句] 1.He makes a living by teaching. 2.He succeeded by working hard. 3.Do you learn English by watching English movies? 4.—How does she learn English? —By reading aloud. [结论] by+v-ing结构在句子中做方式状语,该结构表示通过做某事而得到某种结果.by在以上句子中表示方法、手段、方式等,有“通过/借助/用(某种方法或手段)”等含义.对它引导的介词短语(表方法或手段)提问时,用疑问词how.     

猜谜

1.What word is pronounced wrong even by the best of scholars(学者)? 2.Why are grandpa's false teeth(假牙)like stars? 3.Why do fish live in water?     

外研社《新标准英语》第七册期末试卷

一、听录音,选出你所听到的答语。(10分)()1.Where did you go on your holiday?A.I went to Shanghai.B.I went to Shenzhen.()2.What did you do on your holiday?A.I rowed a boat B.I bought presents.()3.How did you go there?A.I went by train.B.I went by plane.()4.D     

新目标英语九年级Unit 1、Unit 2重点知识讲与练

Unit 1 How do you study for a test?1.询问和表达做事方式询问他人如何做某事通常使用how提问,how意为"如何;怎样"。回答做某事的方法通常使用"by+动名词"形式,by意为"通过;靠"等。例如:     

"喜欢"或"偏爱"之英语表达

1.Do you like popular songs more?你较喜欢流行音乐吗?2.Do you like coffee more than tea?咖啡与茶相比,你更喜欢咖啡吗?3.Do you prefer to watch TV at home?你宁愿呆在家里看电视吗?4.Which is more interesting to you?你觉得哪个更有趣?5.Which is your preference—movie stars or sports stars?你喜欢体育明星还是电影明星?6.Which do you like better?你更喜欢哪一个?7.Which do you prefer,large or small?你更喜欢哪一个,大的还是小的?8.Would you prefer going there by bus or by bike?你喜欢乘公共汽车去那儿,还是骑自…     

新目标英语九年级Unit 1中考考点聚焦

【考点1】A:How do you study for a test? B:I study by working with a group.(p.2)【直击中考】I study for a test____working with a group.(2005北京市海淀区) A.in B.by C.at D.to【解析】选B。介词by表示“通过……手段或方式”,后接名词或动名词。【考点2】What about listening to tapes? (p.3)     

你的意志力有多少?

1.Can you pass by your favourite boutique without popping in and checking out what’s new on the racks? a)Yes b)No     

期末测试题[JEFC](英文)

.单项选择 1 .po,tear〔15 does she want? A.How mueh B.How many C.How mueh kilos‘D一How·about 2 .The teaehers at that sehool are ve巧_.The students like them‘7一’ A.c~funy B.help C.helpfiJI D.friends 3 .when doe,she_the bus?x,m not,ure.But 1 kn卿she doesn,ttake·it int五e morning. A .catchesB_take C.travelD一)fo llb讨犷 4 .1 don,t 90 to sehool by taxi.1 usuallygo_. A .by a boat B.by。ar。c.by boat一”6.勺ri f6of 5 .It,,、e斗hot tod叮.A lotof儿reign Pe叩Ie_hats,,unglasses而d一ighieio…