方程组 (1) x+2y-3z=12 x-3y+2z= - 13 x-y-z=0 (2) x+ y=z 5x-y+z=1
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
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:x-2y+z=-1,x+y+z=2,x+2y+3z=-1
已知方程组4x-5y+2z=0 x+2y=3z 则x:y:z
x/2=y/3=z/5 x+3y-z/x-3y+z
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
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
解方程组2x+y-3z=1,x-2y+z=6,3x-y+2z=9求x,y,z的值
{x+y+z=1;x+3y+7z=-1;z+5y+8z=-2
已知x、y、z满足方程组:x+y-z=6;y+z-x=2;z+x-y=0 求x、y、z的值
解方程组{z=x+y 3x-2y-2z=-5 2x+y-z=3