Mathematics
Senior High
(4)の和をΣで表す解法を教えてください🙇♀️
+6n
(2)
1² +
(1) 6 + 12 + 18 + •
* 3+8+13+...+(5n-2)
* * 1・2 + 3・4 + 5･6 +･･･ + 19･20
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