ΣnCk k=2r k≦2 ΣnCk r>2 ΣnCk=1+2ΣnCk/2−1+nCk/2 k=2r−1 k≦2 ΣnCk=nC1 k>2 ΣnCk=1+2ΣnC[k/2] T.theodor 2023.3.19.
αβγ/α+β+γ= 2rR T.theodor 2023.3.19.
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