\left\{ \begin{array} { l } { x - y ^ { \prime } y = V } \\ { y x - y y = 10 } \end{array} \right.
Ebatzi: x, y (complex solution)
x=V\text{, }y=\frac{\sqrt{V^{2}-40}+V}{2}
x=V\text{, }y=\frac{-\sqrt{V^{2}-40}+V}{2}
Ebatzi: x, y
x=V\text{, }y=\frac{\sqrt{V^{2}-40}+V}{2}
x=V\text{, }y=\frac{-\sqrt{V^{2}-40}+V}{2}\text{, }|V|\geq 2\sqrt{10}
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