有一分数列2/1,3/2,5/3,8/5,13/8,21/13...求出这个数列的前20项的和

l = [1,1] l1 = [] [l.append(l[x] + l[x + 1]) for x in range(20)] print(l) print(len(l)) [l1.append(l[y + 2]/l[y + 1]) for y in range(20)] print(l1) print(len(l1)) print(sum(l1)) l = [1,1] m = [] for x

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