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 thuoc z biet (x-2).(y+12)<0
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
cach lam bai : giup minh voi
tim x thuoc Z biet:
a, /x/+/y/=0
b, /x/ + /y/= 1
tim x ,y thuoc z biet: (x-1)(x+y) =32
Tim cap x,y biet x,y thuoc Z va
2xy- 4+2x+y=0
tim x, y thuoc z biet :
/ x-y / + / y-z/ + /z - x / = 2015
