初一解方程组{3x-2y+z=1,x-y+z=4,x+2y-z=7
解方程组:2x+3y+4z=20,x+y+z=7
解方程组:x-2y+z=-1,x+y+z=2,x+2y+3z=-1
解方程组2x+y-z=7 x+y+z =1 2x-y-z=5
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.
解方程组:x+y+z=4,x+y+2z=5,3x+y-z=6
解方程组x+2y-z=1 ,3x-3y+z=2,2x+3y+z=7和方程组x+y=-14,y+z=-7,x+z=19
解方程组2x+y-3z=1,x-2y+z=6,3x-y+2z=9求x,y,z的值
已知,方程组:4x-3y-7z=0 x+2y=10z 则(x-y+z)÷(x+y+z)=——
4x-3y-6z=0,x+2y-7z=0是一个方程组,那么x-y+z/x+y+z的值等于
解三元一次方程组:x+y+z=6,y-z=4,x-y-2z=3,