3x-4y+3z=4 2x-2y+3z=5 x+4y-5z=6
2x+5y+4z=6,3x+y-7z=-4,x+y-z=?
{2x+3y-4z=-5 x+y+z=6 x-y+3z=10
已知2x+5y+4z=6 3x+y-7z=-4求x+y-z
解方程组:x+y+z=4,x+y+2z=5,3x+y-z=6
5x+3y+2z=2011 4x+6y+7z=2012 求x+y+z
已知x/4=y/5=z/6 求x+y+z/3x-2y+z的值
已知x/4=y/5=z/6,求x+y+z/3x-2y+z的值.
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.
若4x-3y-6z=0,x+2y-7z=0,求代数式5x*5x+2y*2y-z*z/2x*2x-3y*3y-10z*10
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai
已知x:y:z=3:4:5,3x+2y-4z=18.求:x+y+z.
x/3=y/4=z/5,求x+y+z/3x-2y+z的值,