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在三角形ABC中,若cosA＝3分之5,cosB＝4分之5,求证三角形ABC是直角三角形 A plane is flying in a straight line,climbing steadily at a speed of 6m/s through still air.The net force acting on a passenger on mass M in the plane is?先给出答案,再详细说明为什么, 懂英文进.The engine operates in a cycle between temperatures 700k and 400k.the heat input to the engine during each cycle is 2800J.What is the maximum possible work done by the engine in each cycle? 4+5(2x+3)19怎么解 (2x-1)/3 求一个数增加了百分之几用什么法算, 某个数增加百分之几怎么算 C语言求一简单程序,二维数组矩阵,按降序排列,输入矩阵?有一矩阵如下a11 a12 a13 a14 a15 a21 a22 a23 a24 a25a31 a32 a33 a34 a35a41 a42 a43 a44 a45a51 a52 a53 a54 a55ai1-ai4是任意给定的数据,ai5=1/4（ai1+...ai4）,按ai5 C语言编程求解,二维数组矩阵,按降序排列,输入矩阵?有一矩阵如下a11 a12 a13 a14 a15 a21 a22 a23 a24 a25a31 a32 a33 a34 a35a41 a42 a43 a44 a45a51 a52 a53 a54 a55ai1-ai4是任意给定的数据,ai5=1/4（ai1+...ai4）,按ai5进行 c语言编程；有一个3乘3矩阵将矩阵增加一列,求矩阵每一行的元素值的和,并将每一行元素值的和放入增加增加的列 用英文回答:怎么样提高英语?为什么? 如图,已知平行四边形ABCD,E,F分别是AB,CD上的点,AE=AF,M,N分别是DE,BF的中点.求证：ENFM是平行四边形 (一) 完形填空.（每空一词）-- Hello,Kate.It's a beautiful day,isn't it?-- Yes,what a _____ day!Ann and I _____ go on an outing this afternoon.Would you like to go _____ me?-- I'd love _____.Thanks a _____._____and _____ shall we meet?-- Let 《会计英语》用英文回答如下问题,Give an example of a transaction that will affect two assets accounts? 如图,在平行四边形ABCD中,AE=CF,M,N分别为ED、FB的中点,试说明四边形ENFM为四边形15 平行四边形ABCD中,点E F分别是AB CD上的点,AE=CF,M N分别是DE BF的中点.则四边形ENFM是什么图形?拜 怎样计算一个数的百分之几是多少?比如60×5%=?只能把百分数化成小数或整数计算吗,不能把前面的整数化成百分数计算吗?求一直在线,有不懂还要追问. 平行四边形ABCD中,点E F分别是AB CD上的点,AE=CF,M N分别是DE BF的中点.则四边形ENFM是什么图形? 明早要交的!如图,在平行四边形ABCD中,AE=CF,M、N分别为ED、FB的中点试说明四边形ENFM为平行四边形如图,在平行四边形ABCD中,AE=CF,M、N分别为ED、FB的中点,试说明四边形ENFM为平行四边形. 如图,已知AD//BC,∠A=90°,E是AB上的一点,且AD=BE,∠EDC=∠ECD,若AD=3,AB=7,则三角形ECD面积是 如图,∠ACB=90°,且AD=AC,BE=BC,求ECD的度数 算一个数的百分之几怎么算? 3（1-x）+2x=5请问答案 3（2x+1）=4-5（x-3）的答案. A major-league pitcher can throw a baseball in excess of 41.0m/s.If a ball is thrown horizontally at this speed,how much will it drop by the time it reaches a catcher who is 17.0m away from the point of release? C编程写一个函数,使给定的一个二维数组（3*4）进行转置,即行列在、互换,并输出转置前后的结果.(函数) 1.An eagle is flying due east at 8.9m/s carrying a gopher in its talons.The gopher manages to break free at a height of 12m.What is the magnitude of the gopher's velocity as it reaches the ground?Note:effects of air resistance are not included in thi 写一个函数 使给定一个3*3的二维数组转置即行列互换 编写一个函数,使给定的一个n*n矩阵转置,即行列互换./* Note:Your choice is C IDE */#include "stdio.h"void input(int *p,int m,int n){ int i,j;\x09printf("请输入数组：");\x09for(i=0;i 矩阵转置C+编程 描述 写一个函数,使给定的一个矩阵数组转置,即行列互换.比如输入 1 2 3 4 5 6 7 8 9 在excel中,E3为一个if公式,我想在I3中将E3作为一个条件,也写一个if函数,但是为什么不能应用E3的数值?如：E3=IF(D3>=13,"6",IF(D3>=7,"5",IF(D3>=4,"4",IF(D3>=3,"3",IF(D3>=2,"2",IF(D3>=1,"1",IF(D3>=0,"0")))))))；F3=IF(D3>= 输入3行4列的矩阵,按行列形式输出该矩阵.求周边元素之和,并输出