独在异乡为异客的意思

请问第一道题为什么选B 线性代数,这样的行列式等于什么例如a bc d=ad-bc那如果是a b cd e f 线性代数 求问为啥可以排除A的行列式等于0的情况? 声音是通过什么途径传到医生耳朵的?（关于听诊器的） 初二物理“人耳听不见的声音”,各种动物的发声频率越多越好 人说话是靠声带振动来发声的,人平常听到的声音是靠______传入到耳朵里的? 小学四年级秋季运动会作文600字 各种汽车发出喇叭声比如:货车、小骄车.急.是什么样的比如:小骄车是嘀嘀 第一题选什么啊.为什么 秋季田径运动会作文 把 4-12（a-b）+9(b-a)^ 进行因式分解的结果是多少? 这篇英语完型填空怎么写 八上英语完型填空怎么写 英语完型填空请无视我写的 因式分解（a^2-4)^3+6(a^2-4)+9 我的床长是2米,宽是1.2米,要买蚊帐,是该说是2米的床,还是1.2米的呀? He ___ them happily.A.plays with B.playsC.says withD.talks 完形填空怎么写?英语 英语完型填空.能填几个是几个呗. 英语完型填空,怎么写, 如何做英语完型填空 英语中 怎么做完形填空时对的多点. 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!