x-y-z=-1 3x+5y+7z=11 4x-y=2z=-1
x-y-z=-1 3x+5y+7z=11 4x-y+2z=-1 分别求出x=?y=?z=?
{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=-
解下列方程组(1)3x-y+z=3 2x+y-3z=11 x+y+z=12(2)5x-4y+4z=13 2x+7y-3z
已知x:y:z=4:5:7,求:(1)2x+3y+z/5z; (2)x+y/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
已知x::y:z=3:4:5,(1)求x+y分之z的值;(2)若x+y+z=6,求x,y,z.
(1){x-y=2 z-x=3 y+z=-1 (2){x-y-z=2 3x+5y+7z=24 4x-y+2z=26
若x-2y+4z=1,x+3y-7z=0,则y:z=?
(1)3x+4z=7;2x+3y+z=9;5x-9y+7z=8 (2)3x+4y+z=14;x+5y+2z=17;2x+
1.解下列方程(1)(x+y=-2(x+z=13(y+z=1(2)(x-y-z=-1(3x+5y+7z=11(4x-y+
x/2=y/3=z/5 x+3y-z/x-3y+z