(B)  X2 Y2 2 ( X2 1).( Y2 1) 14   XY  2 ( ) XY 2 XY  4 11...

2) (b)  x

 y

 2 ( x

 1).( y

 1) 14   xy  2 ( ) xy

 xy  4 11  (c)

p p

11 3

 

  

( ) 2 4 11 35

c p p p

               

p

3 26 105 0

3

Đặt xy = p.

35

 3

(a)   x y  

 ³ xy  ³  p = xy =

(loại)  p = xy = 3  x y   2 3

xy x y

3 3

 

   

   

  

  

x y 2/ Với

2 3

x y

 