解方程x-y+z=5,①2x+y-3z=15②,3x-2y+z=16③
解方程x-y+z=5,①2x+y-3z=15②,3x-2y+z=16③
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/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2x+3y+z=130,3x+5y+z=180,试求x+2y/z+y+z【在线等高手解方程】
解方程x+y+2z=7① 2x+3y-z=12② 3x+2y+z=13③
解方程:x+y+z=0 ① 4x+2y+z=3 ② 9x+3y+z=6 ③
解关于w,x,y,z的方程w+8x+3y+5z=20①,4w+7x+2y+3z=-20②,6w+3x+8y+7z=20③
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
解方程:x+2y+3z=8 x+3y+5z=6