1.联立下列方程求解

3x+4y-7z-12w 4

5x-7y+4z+ 2w -3

x +8z- 5w 9

-6x+5y-2z+10w -8



2.编写M文件输出“水仙花数”。（水仙花数是指一个3位数，其各位数字的立方和等于该数本身。例如153 13+53+33）



3.已知sphere函数可以产生球表面坐标

（1）用mesh函数绘制球面网线图

（2）用surf函数绘制球表面图

（3）将球表面图切除一部分，-1. The following simultaneous equation solving 3x+4y-7z-12w　 4 5x-7y+4z+ 2w　-3 x+8z- 5w　 9-6x+5y-2z+10w　-8 2. M write file output " narcissistic number."　(Narcissistic number refers to a 3-digit number, the digits of its cube is equal to the number itself. For example 153　 13+53+33) 3. Known sphere function can produce spherical surface coordinate (1) drawn with a reticulated mesh function chart (2 ) drawn with surf function ball surface map (3) removal of a portion of the ball surface map,