Ta có:xy+x+y=15
x.(y+1)+(y+1)=16
(y+1).(x+1)=16=1.16=16.1=2.8=8.2=4.4=(-1).(-16)=(-16).(-1)=(-2).(-8)=(-8).(-2)=(-4).(-4)
Do đó:
y+1 | 1 | 16 | 2 | 8 | 4 | -1 | -16 | -2 | -8 | -4 |
x+1 | 16 | 1 | 8 | 2 | 4 | -16 | -1 | -8 | -2 | -4 |
y | 0 | 15 | 1 | 7 | 3 | -2 | -17 | -3 | -9 | -5 |
x | 15 | 0 | 7 | 1 | 3 | -17 | -2 | -9 | -3 | -5 |
Vậy .......