解方程组:x+y+z=651,1.1z=y,1.
解方程组{x(x+y+z)=6,y(x+y+z)=12,z(x+y+z)=18
解方程组 x+y+z=-7 x-y=12 x+y-z=6
解方程组;1.x+y+z=26,x-y=1,2x-y+z=18 2.5x+y+z=1,2x-y+2z=1,x+5y-z=
解方程组x-4y+z=-3,2x+y-z=18,x-y-z=7.
消去法解方程组{X+Y=70{Y+Z=140{X+Z=90求X、Y、Z
解方程组{2x+3y+z=11,x+y+z=0,3x-y+z=-2.
解方程组x+y-z=-5,x-y-z=1,x-y+z=15
解方程组{3x+y-z=4,2x-y+3z=12,x+y+z=6}
x+z=y 7*x=y+z+2 x+y+z=14 解这个方程组、
x+y/2=z+x/3+y=z/4,...x+y+z=27.解方程组.
解方程组x-y-3z=4 3x+y-z=6 -x+3y+z=8
解方程组:x+y+z=4,x+y+2z=5,3x+y-z=6