x+2y+z/3=5x-y-3z/5=2x-3y+4z/2=3

x/2=y/3=z/5 x+3y-z/x-3y+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 {x+y+z=1;x+3y+7z=-1;z+5y+8z=-2 {2x+3y-4z=-5 x+y+z=6 x-y+3z=10 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, 若x/3=y/4=z/5,求x+y+z/3x-2y+z的值. 2x+5y+4z=6,3x+y-7z=-4,x+y-z=? 已知方程组4x-5y+2z=0 x+2y=3z 则x:y:z 2x+5y+4z=0,3x+y-7z=0,则x+y-z=? 解方程组：x+y+z=4,x+y+2z=5,3x+y-z=6