解方程{x+2y=5 x-y+2z=1 2x+y-z=3
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
已知2x+3y+z=130,3x+5y+z=180,试求x+2y/z+y+z【在线等高手解方程】
x:y:z=1:2:3 x+2y+3z=56解方程
x+2y+3z=28 x:y:z=1:2:3 解方程
解方程:x+2y+3z=8 x+3y+5z=6
3x-y+z=3 2x+y-3z=11 x+y+z=12 解方程
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
x/2=y/3=z/5 x+3y-z/x-3y+z
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
已知x,y,z,同时满足方程x+3y-5z=0,2x-y-3z=0求x:y:z的值
{x+y+z=1;x+3y+7z=-1;z+5y+8z=-2