解方程{x+y+z=6,2x-y+z=3,4x-y+2z=8速度!
解方程{3x -y+z=4 2x+3y-z=12 x+y+z=6
解方程:{2x+3y+z=7,x+y+z=4,3x+y-z=-4
解方程:x+2y+3z=8 x+3y+5z=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
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}
解方程组:x+y+z=4,x+y+2z=5,3x+y-z=6
①x+y+z=6 3x-y+2z=12 x-y-3z=-4 ②x+y-z=2 4x-2y+3y+8=0 x+3y-2z-
2x 6y z=7和3x 9y z=8求x y z=几解二愿以此方程,我知道x y
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
3元1次方程x-2y=-9 3x-y+z=4{ y-z=3 { 2x+3y-z=122z+x=47 x+y+z=6