Question

澪

求解

2 a., Az, A3, A4 8 4 2 2 2 2 2 5), te Ait Az=16, A3+4= 28,
貝么差d?
(A) 1 (B)2 (c)3 CD4

Answer 1

Miyeon

公式：An=a1+d(n-1)