Odpowiedź :
10[tex]p^{2}[/tex] - [tex]r^{2}[/tex] + r = 10 * [tex]2^{2}[/tex] - [tex]7^{2}[/tex] + r = 10 * 4 - 49 + 7 = 40 - 49 + 7 = -9 + 7 = - 2
10[tex]p^{2}[/tex] - [tex]r^{2}[/tex] + r = 10 * [tex]2^{2}[/tex] - [tex]7^{2}[/tex] + r = 10 * 4 - 49 + 7 = 40 - 49 + 7 = -9 + 7 = - 2