解方程组 x+y-z=13 y+z-x=-1 z+x-y=13
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=22,y+z=13,z+x=-27
解方程组x+y=13,y+z=9,x+z=2
求方程组 {x+y-z=1 2x+3y-z=13
解方程组:x-2y+z=-1,x+y+z=2,x+2y+3z=-1
解方程组x+y-z=-5,x-y-z=1,x-y+z=15
方程组x-y-z=5 y-x-z=1 z-x-y=-15的解是?
解方程组2x+y-z=7 x+y+z =1 2x-y-z=5
(x+y-z)(x-y+z)=
怎样解三元一次方程组(1)x+y-z=11,y+z-x-5,z+x-y=1
解三元一次方程组,100x+10y+z=27(x+y+z) {x+y-z=1 (100z+10y+x)-(100x+10
解方程组2x+y-3z=1,x-2y+z=6,3x-y+2z=9求x,y,z的值