x-3y+2z=1 2x+2y-3z=-10 4x-8y+5z=6
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai
{2x+3y-4z=-5 x+y+z=6 x-y+3z=10
{x+y+z=1;x+3y+7z=-1;z+5y+8z=-2
2X+Y+Z=10,X+2Y+Z=-6,X+Y+2Z=8 5X+4Y-3Y=13,2X-3Y+7Z=19,3X-Y=2X
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.
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
x/2=y/3=z/5 x+3y-z/x-3y+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
x+y+z=4 2x+3y-z=6 3x+2y+2z=10
3x+2y+z=14 ,x+y+z=10,z+2x+3y=1 5
2x+5y+4z=6,3x+y-7z=-4,x+y-z=?
解方程组:x+y+z=4,x+y+2z=5,3x+y-z=6