题目内容

/有一分数序列： 2 / 1 3 / 2 5 / 3 8 / 5 13 / 8 21 / 13......求出这个数列的前N项之和，保留两位小数。请填上合适的表达式, 使程序正确完整。//提示：当前项分子等于前项分子和分母之和；当前项分母等于前项分子；/#includeusing namespace std;#include int main(){float n, a = 2, b = 1, s = 0;cin >> n;for (int i = 0; i <; i++) /【1】/{s = s + a / b;a =;/【2】/b = a - b;}cout << setiosflags(ios::fixed) << setprecision(2);cout << s << endl;}

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