Darmowe konto pozwoli wrócić do niego później.

B. $\begin{cases}(\alpha + \beta) + \beta = 180°\\\alpha + \beta = 2\alpha - \beta\end{cases}$

C. $\begin{cases}(\alpha + \beta) + \beta = 180°\\\beta = 2\alpha - \beta\end{cases}$

D. $\begin{cases}\alpha + \beta = 90°\\\beta = 2\alpha - \beta\end{cases}$

E. $\begin{cases}\alpha + \beta = 2\alpha - \beta\\180° - (2\alpha - \beta) = \beta\end{cases}$

F. $\begin{cases}3\alpha + 2\beta = 360°\\2\alpha - \beta = 2\beta\end{cases}$