解方程组2x+3y+z=6 x-y+2z=-1
解方程组:2x-y+z=6.-3x+2y-z=-9.x+y-2z=-1求解
解方程组2x+3y+z=6x−y+2z=−1x+2y−z=5
解方程组(1)x+y−z=6x−3y+2z=13x+2y−z=4
解方程组2x+y-3z=1,x-2y+z=6,3x-y+2z=9求x,y,z的值
解方程组x:y=1:5y:z=2:3x+y+z=27.
解方程组{x+4y-z=2,2x+3y+z=4,3x+5y+z=9,先消去未知数z得到的二元一次方程组是
已知方程组{2x-y+z=3,3x+4y-z=8,x+y-2z=-3,
解方程组:x+2y+3z=62x+3y+z=63x+y+2z=6
解方程组:x-2y+z=-1,x+y+z=2,x+2y+3z=-1
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
解方程组2x-y+3z=3,3x+y-2z=﹣1,x+y+z=5,若先消去Z得到含Y,X的二元一次方程组是什么