解方程组3x+y+2z=8,x+y+z=5,2x+3y+4z=7
解方程组:x+y+z=4,x+y+2z=5,3x+y-z=6
三元一次方程组2x+z=3 3x+y-z=8 x+3y+2z=3 5x+2y-3z=2 x+2y+z=6 7x-2y-4
解方程组:2x+3y+4z=20,x+y+z=7
解方程组{z=x+y 3x-2y-2z=-5 2x+y-z=3
解方程组 z=x+y 2x-3y+2z=5 x+2y-z=3
解方程组{3x+y-z=4,2x-y+3z=12,x+y+z=6}
解方程组x-4y+z=-3,2x+y-z=18,x-y-z=7.
x+y/2=z+x/3+y=z/4,...x+y+z=27.解方程组.
已知方程组4x-5y+2z=0 x+2y=3z 则x:y:z
3x-y+2z=8 2x+2y-4z=9 7x+y-5z=-4解方程组
解方程组3x+y+2z=8,x+y+z=5,2x+3y+4z=7
已知,方程组:4x-3y-7z=0 x+2y=10z 则(x-y+z)÷(x+y+z)=——