解方程:{2x+3y+z=7,x+y+z=4,3x+y-z=-4
解方程:{2x+3y+z=7,x+y+z=4,3x+y-z=-4
解方程{3x -y+z=4 2x+3y-z=12 x+y+z=6
解方程一;{x+y-z=6,x-3y+2z=1,3x+2y-z=-7.②{3x+4z=7,2x+3y+z=9,5x-9y
X-Y-Z=4 3Y-X-Z=8 7Z--X-Y=16 这三个方程联立求x y z
三元方程求救要过程2x+3y+z=383x+4y+2z=564x+5y+z=66x:y=5:3x:z=7:32x-y-z
x=y/z=z/3,x+y+z =12,求2x+3y+4z是多少,
2x+4y+3z=9 3x-2y+5z=11 5x-6y+7z=13 这个方程怎么解?
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
3x-y+z=3 2x+y-3z=11 x+y+z=12 解方程
解方程组{3x+y-z=4,2x-y+3z=12,x+y+z=6}
2x+5y+4z=6,3x+y-7z=-4,x+y-z=?
x+2y+4z=17 2x+y+z=7 3x+y+2z=11