若4x-3y-6z=0,2x+4y-14z=0,(z不等于0）,求(2X^2+3y^2+6z^2)/(x^2+5y^2+7z^2)的值

若4x-3y-6z=0,x+2y-7z=0,则x+y+z/3x-y+z=? 三元一次方程x+y+z=0 4x+2y+z=3 9x+3y+z=6x+y+z=04x+2y+z=3 9x+3y+z=6 X+y-z=6;x-3y+2z=0;3x+2y-z=4 {x+y+z=0 4x+2y+z=3 9x+3y+z=6 {x+y+z=0 {4x+2y+z=3 {9x+2y+z=6 若x/2=y/3=z/4不等于0,求x+y+z/x+y-z的值 1.{x:y:z=3:4:5 2x+3y-5z=-142.{x-y-z=-1 3x+5y+7z=11 4x-y+2z=-13.{x+y=1 x+z=0 2x+y+2z=44.{x-y+z=-3 2x-y-z=-2 -3x+y+z=-15.{x-y+z=-3 3x+y-4z=6 2x+y-z=36.{x-2y+5z=16 2x+y-5z=7 2x-y+z=38 三元一次方程组,1.x-2y+z=9 2x+y+3z=10 3x+2y1.x-2y+z=92x+y+3z=103x+2y-z2.3x-5y+2z=14x+5y-z=5X-5y+3z=-23.7x+2y-z=76x-y+z=74x+3y+z=94.4x+3y-2z=-75x-6y+z=12x+z=-25.2x+3y-4z=-23x-2y+5z=262x+5z=31 若(4x-3y-3z)^2+|x-3y-z|=0 且xyz不等于0 则4x+y-z/x+y+z 的值 已知x²+y²+z²-2x+4y-6z+14=0,求x+y-z/x+y+z的值 已知4x-3y-6z=0,x+2y-7z=0,求5x+2y-z/2x-3y-10z 已知方程组4x-y+3z=0 2x+y+6z=0且xyz不等于0,则x/y+y/z+z/x是多少 已知4x-3y-6z=0,x+2y-7z=0,则x-y+z/x+y+z=_________ 已知4x-3y+6z=0 x+2y-7z=0 则x-y+z/x+y-z=? 4x-3y-6z=0,x+2y-7z=0,x-y+z/x+y+z=? 已知{4x-3y-6z=0、x+2y-7z=0,则x-y+z：x+y+z= 4x-3y-6z=0,x+2y-7z=0是一个方程组,那么x-y+z/x+y+z的值等于 已知有理数x、y、z满足条件|x-z-2|+(3x-6y-7)^2+|3y+3z-4|=0,求x、y、z