(x+y+z)^5-x^5-y^5-z^5
(x+y+z)^5-(x+y-z)^5-(x+z-y)^5-(z+y-x)^5,
x/2=y/3=z/5 x+3y-z/x-3y+z
1.(x+y-z)+(x-y+z)-(x-y-z) 2.2x-(3x-2y+3)-(5y-2)
因式分解:25x y^2 z^2 (x+y-z)-30xyz(z-x-y)^2+5x y z^3 (z-x-y)
{x+y+z=1;x+3y+7z=-1;z+5y+8z=-2
一道数奥题,(x+y-z)²+(y+z-4)=-|z+x-5|
已知3X=4X,5Y=6Z求X+Y:Y+Z
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai
{5X+Y+Z①X+5Y+Z=-2②X+Y+5Z=10③
若x+3y+5z=10,5x+z+3y=8,x+y+z=?
已知3x-2y-5z=0,2x-5y+4z=0,且x,y,z均不为0,求3x*x+2y*y+5z*z/5x*x+y*y-
已知5x+3y=3z,-x-3y+z=0,求x:y:z