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题目： There is a public bike service in Hangzhou City which provides great convenience to the tourists from all over the world. One may rent a bike at a ......

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。 #include<stdio.h> int main(){ double Sn=0,an=0,n,i,t,a=2.0,b=1.0;//a为分子，b为分母，an为单项和值，Sn为 ......