( x-2 ) . ( y+1 ) = - 2
Ta có : -2 = -2 . 1 = -1 . 2
Ta có bảng :
| x-2 | -2 | -1 | X | X |
| y+1 | 1 | 2 | X | X |
| x | 0 | 1 | X | X |
| y | 0 | 1 | X | X |
Vậy, .......
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