Odpowiedź:
to: Odpowiedź:
Wyraz ogólny: an = a1 + (n - 1)d to an = - 75 + (n - 1)•60
-75, -15, 45, 105, 165, 225, ..., an
Szczegółowe wyjaśnienie:
a2 + a3 = 30 to a1 + d + a1 + 2d = 30 to 2a1 + 3d = 30
a4 - a2 = 120 to a1 + 3d - (a1 + d) = 120 to 2d = 120 to d = 60
2a1 + 3•60 = 30 to 2a1 = 30 - 180 = - 150 to a1 = - 75
to: Odpowiedź:
Wyraz ogólny: an = a1 + (n - 1)d to an = - 75 + (n - 1)•60
-75, -15, 45, 105, 165, 225, ..., an
