5x+3y+z=100
x/2=y/3=z/5 x+3y-z/x-3y+z
已知5x+3y+1/3z=100 7x+y+z=100 那么x+y=?
{x+y+z=1;x+3y+7z=-1;z+5y+8z=-2
已知3X=4X,5Y=6Z求X+Y:Y+Z
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai
若x+3y+5z=10,5x+z+3y=8,x+y+z=?
X+Y=Z 2X-3Y+2Z=5 X+3Y-Z=3
{2x+3y-4z=-5 x+y+z=6 x-y+3z=10
x+y=z 2x-3y+2z=5 x+2y-z=3
解方程组{z=x+y 3x-2y-2z=-5 2x+y-z=3
若x/3=y/2=z/5,则2x-3y-z/x-y+z=