Explicație pas cu pas:
[tex] \frac{5}{11} = \frac{x}{ {2}^{2} + 2 \times {3}^{2} } \\ \frac{5}{11} = \frac{x}{4 + 2 \times 9} \\ \frac{5}{11} = \frac{x}{4 + 18} \\ \frac{5}{11} = \frac{x}{22} = > x = \frac{5 \times 22}{11} = \frac{110}{11} = 10 [/tex]
Succes!
