Mathematics
Senior High
65の2番の問題の解き方を教えてください！
答えは写真に載せてあります！
65 次の和Sを求めよ。
11) S=1-4+4-7 + 7-10 + 10-13
(2) S=1+
1+2+1+²+3
+
+......+
・+
→教p.31 応用例題2
1
(3n-2)(3n+1)
1
1+2+3+ +n
65
66
n
3n+1
√n+2-√2
(1)
(2)
2n
n+1
(3n-1).4"+1
3'
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