y-3x-2z=1,x+2y+3z=9,5x-7y+z=34
{x+y+z=1;x+3y+7z=-1;z+5y+8z=-2
x/2=y/3=z/5 x+3y-z/x-3y+z
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
x-y-z=-1 3x+5y+7z=11 4x-y+2z=-1 分别求出x=?y=?z=?
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
{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.
(1)3x+4z=7;2x+3y+z=9;5x-9y+7z=8 (2)3x+4y+z=14;x+5y+2z=17;2x+
y-3x-2z=1 ;x+2y+3z=9 ;5x-7y+z=34 ;解这个三元一次方程组.
y-3x-2z=1,x+2y+3z=9,5x-7y+z=34
三元一次方程组y-3x-2z=1 x+2y+3z=9 5x-7y+z=34怎么解
x+2y-z=1 3x-3y+z=2 3x+3y+z=7