Mathematics
Senior High
Resolved
136. 120. 105. ‥‥ 15. 10. 6. 3 は階差数列だと思うんですけど、この数列の和はどうやって求めたら良いですか？？お願いします😿
9
13
15. гO
-5
-4
55
JT
JT
-1
-
5
-14
-6
{ang
1360
G
012644-1
(on take
120.105.
L15
G
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