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若\(\left\{ {\begin{array}{*{20}{l}} {x = 1} \\ {y = - 2} \end{array}} \right.\)是关于\(x\)，\(y\)的方程组\(\left\{ {\begin{array}{*{20}{l}} {mx - ny = 1} \\ {5x + 2my = - 3} \end{array}} \right.\)的解，则\(m = \)___，\(n = \)___。
参考答案：2；\( - \frac{1}{2}\)
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