解方程组：X+Y+Z=86 5X=6Y 5X=9Z

解方程组：x+y+z=4,x+y+2z=5,3x+y-z=6 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=5 y+z=6 x+z=7 {x+y+z=6,x-z=2,2x-y+z=5 解方程组 解方程组x+y-z=-5,x-y-z=1,x-y+z=15 解方程组{z=x+y 3x-2y-2z=-5 2x+y-z=3 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 解方程组 z=x+y 2x-3y+2z=5 x+2y-z=3 怎样解三元一次方程组(1)x+y-z=11,y+z-x-5,z+x-y=1 方程组2x+4y+3z=9,3x-2y+5z=11,5x-6y+7z=13的解是什么 解方程组{3x+2y+z=6,x+3y+z=5,x+y+3z=9谢谢了,