\(\frac{x}{4}\)- \(\frac{1}{y}\)=\(\frac{1}{2}\)
\(\frac{x}{4}\)-\(\frac{1}{2}\)= \(\frac{1}{y}\)
\(\frac{x}{4}\)-\(\frac{2}{4}\)=\(\frac{1}{y}\)
\(\frac{x-2}{4}\)=\(\frac{1}{y}\)
\(\Rightarrow\)\(y\cdot\left(x-2\right)\)= 4
Vì \(y\in Z,x-2\in Z\)nên ta có bảng:
y | 1 | 4 | 2 | -1 | -4 | -2 |
x-2 | 4 | 1 | 2 | -4 | -1 | -2 |
x | 6 | 3 | 4 | -2 | 1 | 0 |