Mathematics
Senior High
Solved
計算した時にどうして4(k+1)になるのかが分かりません
=k+1のときを考えると,②から
3
3
23 +43 +63 +......+(2k)³+{2(k+1)}³
=2k2(k+1)+{2(k+1)}³
=2(k+1)²{k²+4(k+1)}+
+S
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