对于 Fibonacci 数列:
f i = { [ i = 1 ] i ≤ 1 f i − 1 + f i − 2 i > 1 f_i = {[i=1]i≤1fi−1+fi−2i>1" role="presentation">{[i=1]fi−1+fi−2i≤1i>1{[i=1]i≤1fi−1+fi−2i>1 fi={ [i=1]fi−1+fi−2i≤1
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