4X+Y=14...1 5Y+2Z=60...2 7X-Z=2.3如何解
解方程一;{x+y-z=6,x-3y+2z=1,3x+2y-z=-7.②{3x+4z=7,2x+3y+z=9,5x-9y
解方程组2x+y-z=7 x+y+z =1 2x-y-z=5
x-y-z=-1 3x+5y+7z=11 4x-y+2z=-1 分别求出x=?y=?z=?
如何解方程组(x+2y)(x+2z)=-16,(y+2z)(y+2x)=8,(z+2x)(z+2y)=-7
{x+y+z=1;x+3y+7z=-1;z+5y+8z=-2
{5x-3y+z=2{5x+2y-4z=3{-5x+y-z=2 {x-y-z=-1{3x+5y+7z{4x-y+2x=-
已知x:y:z=4:5:7,求:(1)2x+3y+z/5z; (2)x+y/y+z.
解方程:{2x+3y+z=7,x+y+z=4,3x+y-z=-4
2x+5y+4z=6,3x+y-7z=-4,x+y-z=?
解方程组:x+y+z=4,x+y+2z=5,3x+y-z=6
已知2x+5y+4z=6.3x+y-7z=-4 求 x+2y+z
2x+5y+4z=0,3x+y-7z=0,则x+y-z=?