方程组 3X+2Y+Z =13X+Y+2Z =72X+3Y-Z =12
解方程组{3x+y-z=4,2x-y+3z=12,x+y+z=6}
三元一次方程组数学题x+2y+2z=33x+y-2z=72x+3y-2z=10x-y=2z-x=3y+z=-1x-y-z
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
求方程组 {x+y-z=1 2x+3y-z=13
解二元一次方程组X:Y:Z=1:2:3,X+Y+Z=12
解下列方程组(1)3x-y+z=3 2x+y-3z=11 x+y+z=12(2)5x-4y+4z=13 2x+7y-3z
解方程组{z=x+y 3x-2y-2z=-5 2x+y-z=3
解方程组 z=x+y 2x-3y+2z=5 x+2y-z=3
解方程组:x-2y+z=-1,x+y+z=2,x+2y+3z=-1
解方程组{2x+3y+z=11,x+y+z=0,3x-y+z=-2.
三元一次方程组x+y/3=x+z/2=y+z/2 x+y+z=28
解方程组x-4y+z=-3,2x+y-z=18,x-y-z=7.