解方程组:x:y:z=1:2:32x−y+3z=21
解方程组:3x−y+2z=32x+y−3z=11x+y+z=12
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x:y=1:5y:z=2:3x+y+z=27.
解方程组:3x+2y+5z=2x−2y−z=64x+2y−7z=30.
解方程组:5x−4y+4z=132x+7y−3z=193x+2y−z=18
解方程组:2x-y+z=6.-3x+2y-z=-9.x+y-2z=-1求解
解方程组:x−43=y+14=z+25x−2y+3z=30
解方程组x−4y=0x+2y+5z=22x+y+z=12
已知方程组x:y:z=1:2:7 2x−y+3z=42
解方程组:x-2y+z=-1,x+y+z=2,x+2y+3z=-1
解方程组1、4x+9y=12,3y-2z=1,2x+6z=32、3x-y+2z=3,2x+y-3z=11,x+y+z=1