解方程组+x+y=14++y+z=-7++x+z=9
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=-7 x-y=12 x+y-z=6
解三元一次方程组:{x+y+z=4 2x+y+3z=9 x+3y+2z=14 {3x+y-z=7 x+2y+2z=12
解方程组{x(x+y+z)=6,y(x+y+z)=12,z(x+y+z)=18
解方程组 2x+y+z=7 x+2y+z=8 x+y+2x=9
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-z=7 x+y+z =1 2x-y-z=5
方程组 2x+y+z=7,x+2y+z=8,x+y+2z=9 快
解三元一次方程组 x+y=12 x+y+z=10 z-y-z=14 急
解x(x+y+z)=4-yz、y(x+y+z)=9-xz、z(x+y+z)=25-xy方程组
解方程组2x+y-3z=1,x-2y+z=6,3x-y+2z=9求x,y,z的值
如何解方程组(x+2y)(x+2z)=-16,(y+2z)(y+2x)=8,(z+2x)(z+2y)=-7