Question

NCiiiiiii

請問為什麼這題原本是a3+a13=38但後面又變成=18？？求解謝謝🙏🏻

, Q.,若a=37,
一等差數列 ai,02,03,
03 + dis = 38,則當 at = -19 時,比之值為何?
解:
-

.
-
2. :az +213=38 . (ai+2d) + (a1 +12d) =18
=
♡ 2X37+14d=18 D d=-4
D a=37 · d=-4 ..ax=a1 + (k-1) d
D -19=37+ (k-1) X (-4) ok=15
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-

Answer 1

❀͜ৡৢৢ͜͡.y̶u̶.يًٌٍَُِ࿐

(-19)+37
解答寫太快

Answer 2

Sherry1216

我覺得是解答寫錯😂

NCiiiiiii

好喔 謝謝你🙇🏻‍♂️