Mathematics
Senior High
なぜこの最後の式のようになるのか教えてください!
2N
Σ CR
k=1
=
C₁+C2
+C3+C4
+C5+C6
+..
+ C2N-1+ C2N
N
Σ (C₂m-1+C2m).
m = 1
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