x-y+3z=4,3x+y-z=6,-x+3y+z=8,求x,y,z的值_数学解答

x-y+3z=4,3x+y-z=6,-x+3y+z=8,求x,y,z的值

人气：130 ℃　时间：2020-07-29 09:04:44

解答

设三个方程序号1,2,31:x-y+3z=4;x=4-3z+y2:3x+y-z=6;3(4-3z+y)+y-z=6;12-9z+3y+y-z=6;4y-10z=-6;2y-5z=-3;y=(-3+5z)/23:-4+3z-(-3+5z)/2+3(-3+5z)/2+z=8;-8+6z+3-5z-9+15z+2z=1618z=36;z=2