X*256+Y*265+Z*274+29*5=7894

x/2=y/3=z/5 x+3y-z/x-3y+z (x+y-z)(x-y+z)= (x+y+z)^5-(x+y-z)^5-(x+z-y)^5-(z+y-x)^5, X+Y+Z=? {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=? f(x,y,z,w)=x*(x+y)*(x+y+z)*(x+y+z+w) {2x+3y-4z=-5 x+y+z=6 x-y+3z=10