Tim x y z biet x/(y-z)=y/(x+z)=z/(y-x)=x-y+z
Tim x,y,z biet x-y+z=x/(y*z)=y/(z+x)=z/(y-x)
tim x,y,z thoa man x/y+y/z+z/x=y/x+z/y+x/z=x+y+z=3
tim x,y,z bieetrts x/y+z+1=y/x+z+1=z/x+y-2=x+y+z
tim x;y;z sao cho : x/(y+z+1)=y/(z+x+1)=z/(x+y-2)=x+y+z
tim x,y thuoc z biet x/5=y/3=z/4 và x-z=7
tim x,y thuộc z biết x/3=y/4=z/5 và 2z+3y+5z=86
x/y+z+1=y/z+x+1=z/x+y-2/=x+y+z tim x,y,z
tim x; y; z biết y+z+1/x=x+z+2/y=x+y-3/z=1/x+y+z
tim x,y,z biet; x/z+y+1=y/x+z+1=x+y-2=x+y+z