(B) X2 Y2 2 (X2 1).(Y2 1) 14 XY 2 (XY)2 XY 4 11 (C) P PĐẶT XY = P...
2) (b)
x
2
y
2
2 (
x
2
1).(
y
2
1)
14
xy
2 (
xy
)
2
xy
4
11
(c)p
p
Đặt xy = p.( )
2
2
4
11
2
11
3
35
c
p
p
p
p
p
p
3
26
105
0
3
(a)x
y
2
3
xy
3
p = xy =35
3
(loại) p = xy = 32 3
x
y
xy