\(x-y+2xy=3\)
\(\Rightarrow2xy+x-y=3\)
\(\Rightarrow x\left(2y+1\right)-y=3\)
\(\Rightarrow2x\left(2y+1\right)-2y=6\)
\(\Rightarrow2x\left(2y+1\right)-\left(2y+1\right)=5\)
\(\Rightarrow\left(2x-1\right)\left(2y+1\right)=5\)
\(\Rightarrow\left(2x-1\right);\left(2y+1\right)\inƯ\left(5\right)=\left\{\pm1;\pm5\right\}\)
Xét bảng
| 2x-1 | 1 | -1 | 5 | -5 |
| 2y+1 | 5 | -5 | 1 | -1 |
| x | 1 | 0 | 3 | -2 |
| y | 2 | -3 | 0 | -1 |
Vậy..............................
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