tim x,y biet x,y thuoc z voi x,y cung dau x+y+|y|=2015
tim x,y,z thuoc z biet /x/+/y/+/z/=0
tim x,y thuoc Z biet x*y=x+y
tim x,y,z thuoc Z biet /2x-4/+/y+2/+/2x+3y-z/=0
Cho A thuoc {0.1.2.3.4.5.6.7.8.9.10} biet A co hon 1 phan tu neu x,y,z thuoc A va x<y<z thi z =x.y tim A
tim x,y thuoc Z biet xy=x-y
tim x,y thuoc z biet
-24/-6 = x/3 = 4/y^2 = z^3/-2
tim x ,y thuoc z biet: (x-1)(x+y) =32
tim x, y thuoc Z biet x+y -x.y = 7
