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对角线全为0 其他为-1 的矩阵行列式 证明等于 det(I-全是1的矩阵)det （0 -1 -1...-1）(-1 0 -1.-1)对角线全为0 其他为-1证明等于 det(I-全是1的矩阵)用分块的方法 n阶对角线为5其他为1的矩阵的行列式是多少? 完形填空A French writer tells a stroy about his cat and parrot.A friend of ___1___came to visit him one day.The friend said,"I'm going away ___2___a short time.Will you please ___3___ my parrot for me?"The writer said he would do ___4___,and his 帮忙做道英语完形填空Many animals use some kinds of"language".They use signals which have meanings.For example,when a bee has found some food,it goes _1_ its home.It is _2_ for a bee to tell _3_ bees where the food is by speaking to them,but 这道英语完形填空怎么做Food is very important . Everyone needs to 1 well if he or she wants to have a strong body. Our minds also need a kind of food . This kind of food is 2 .We begin to get knowledge even when we are very young . Small 几道英语完形填空1.It is kind of her___(help) me with my English 2.After___(look)around for a while ,I sat down on a beach3.I'll give him that message when he___(return)4.The man had both of his legs___(injure)in his accident a/b=21 a+b+b=27 初一英语1-5小题求帮忙 只要1到5小题就行了,先到先得哦 求一个3*3矩阵对角线元素之和!用C语言编写!最好是用C++!怎么写!谢谢!~通过双重for循环控制输入二维数组a,再将a[i][i]累加后输出! 矩阵中什么条件下对角线元素调换位置,负对角线元素変号?2阶逆矩阵成立，为什么在分块矩阵中就不成立了？ c语言 求N*N矩阵中主对角线和次对角线的元素之和在N*N矩阵中（N行N列的数组）,求主对角线和次对角线的元素之和. 已知：a+b=45,a-b=27,求a、b的值 a∶b=4∶5,a＋b＝27求a-b的值 若|a|=2,|b|=27,且|a+b|=负(a+b),求a-b的值 初一英语问题 急!只有一小题三.根据释义及所给的字母,完成下列单词拼写1. d________(not the same) I like to eat ______kinds of food.2. r_________(a room where people have meals) she likea to eat in s______.3. b_______(a Shall we read the story together?____ ______ read the story together? 几道初一英语题目根据首字母提示完成单词She wants to be the s___ of the fashion show.Mr John give us a talk on the moon every day.(用two days later改写）Mr John ____ _____ ______ ______us a talk on the moon two days lather.she we We learned a lot ______ animals in the zoo.A in B with C about D forWhat shall we do on the weekend?------Let's go ______.A fish B fishing C to fish D fishesWe were tired,_____we had great fun. A but B or C and 初一英语第一大题1-4小题求帮忙 二阶单位矩阵对应的行列式的值为几? 1.( )Morther came back home___some fruit in her bag.A.in B.for C.with D.by 2.( )I summer,you can___the sound of thunder（雷）on a rainy day.A.hear B.listen to C.hear of D.listen 3.We are all very___(surprise)that the man climbs up to the top of th 一种刚才九分之八米重二十四分之一吨,每米刚钢材重多少吨?六分之一吨的钢材厂多少米? 一种钢材九分之八米重二十四分之一吨,每米重多少吨?每吨这样的刚才总长是多少米?要得数和过程 一种钢材长四分之三米,重八十分之九吨,这样一吨钢材长多少米?这样的钢材1米重多少吨? 开头是＂在动物运动会上,参赛的动物各显神通＂的短文200字左右的 体育卡通-动物运动会请问一下,北京6台前几年播出的小型体育短片动物运动会,里面介绍的动物有一个河马,一个猫和一个小黄猪,请问哪里有他们的视频啊?孤僻亟地啊,你说的对我来说才全是 2012年初一英语假期作业答案55页 作文：动物运动会的作文600字,谢谢大神,急用, 动物运动会短跑最快的动物是什么?长跑最快的动物是什么?游得最快的动物是什么?潜水最深的动物是什么?飞的最快的动物是什么?飞的最高的动物是什么? 根据国家,填表国家 城市（首都/重要城市） 国语 国人（单/复）例：China Beijing/Shanghai Chinese Chinese/Chinese JapanFrancethe United Statesthe United KingdomAustraliaSingapore最好加上所填的汉意 根据已给出的开头字母填空.I am going to take Jack a________ a Beijing siheyuan.