Odpowiedź:
[tex]pierwszy \: bok = x + 5cm \\ drugi \: bok = x \\ L = 50cm \\ x + 5 + x + x + 5 + x = 50 \\ 4x + 10 = 50 \\ 4x = 50 - 10 \\ 4x = 40 \\ x = 40 \div 4 \\ x = 10cm \\ \\ x + 5cm = 10cm + 5cm = 15cm \\ x = 10cm \\ P = 15cm \times 10cm = {150cm}^{2} [/tex]
Odp. Pole tego prostokąta wynosi 150cm^2.
