解方程组2x+y-z=7 x+y+z =1 2x-y-z=5
解方程组2x+y-z=7 x+y+z =1 2x-y-z=5
解方程组:x-2y+z=-1,x+y+z=2,x+2y+3z=-1
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
x+z=y 7*x=y+z+2 x+y+z=14 解这个方程组、
解方程组:x+y+z=4,x+y+2z=5,3x+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+2y-z=1 ,3x-3y+z=2,2x+3y+z=7和方程组x+y=-14,y+z=-7,x+z=19
如何解方程组(x+2y)(x+2z)=-16,(y+2z)(y+2x)=8,(z+2x)(z+2y)=-7
解方程组2x+y-3z=1,x-2y+z=6,3x-y+2z=9求x,y,z的值
解方程组 2x+y-z=2 x+2y=5 x-y+2z=-7
解三元一次方程组:x-y+z=7 2x-y-z=0 x+y=-1