Odpowiedź:
a₅/a₃ = 1,6
Szczegółowe wyjaśnienie:
[tex]a_1 = 4\\a_3 = a_1 + 6 = 4+6 = 10 \\i\\a_3 = a_1 + 2r = 4+2r\\\frac{a_5}{a_3} = ?\\\\4+2r = 10\\\\2r = 10-4\\\\2r = 6 \ \ /:2\\\\r = 3\\\\\\a_{n} = a_1 + (n-1)\cdot r\\\\a_5 = a_1 + 4r\\\\a_5 = 4+4\cdot3 = 4 + 12 = 16\\\\a_3 =10\\\\\frac{a_5}{a_3} = \frac{16}{10} = 1,6[/tex]
