Tim x, y thuoc Z biet : | x-2| + (x-y+1)^2 =0
tim x,y,z thuoc z biet /x/+/y/+/z/=0
tim x,y,z thuoc Z biet /2x-4/+/y+2/+/2x+3y-z/=0
cho P =|x|.(y-1).Tim x,y thuoc Z biet P<0
Tim cap x,y biet x,y thuoc Z va
2xy- 4+2x+y=0
Tim x,y thuoc Z biet
x^2=I5+y^2
tim x, y thuoc z biet :
/ x-y / + / y-z/ + /z - x / = 2015
tim x,y thuoc z biet
-24/-6 = x/3 = 4/y^2 = z^3/-2
tim x,y thuoc Z biet x*y=x+y
