Physics
Undergraduate
213の(2)教えてください
213 次の数列の第k項を求めよ。 また, 初項から第n項までの和を
(1)
12+1・2+22, 22+2・3+32, 32 + 3・4
*(2) 12, 12+32,12+32 +52, 12+2+5+72,
+ 42,
ARE ÅT (K-1)
.....
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