ta co 2 chia het cho[x-2] suy ra x-2 la uoc cua 2

ta co uoc cua 2=1,2

ta co 2 Th

TH1 x-2=1 x=1+2 =3

TH2 x-2=2 x=2+2 =4

Vay x mang nhung gia tri 3,4 neu x thuoc so tu nhien

neu x la so nguyen am thi x-2=[-2],[-1]

ta co 

neu x-2 =[-1] thi x=[-1]+2=[-1]

 neu x-2 =[-2] thi x=[-2]+2=0

vay x mang nhung gia tri la ;3,4,0,[-1]