多项式求和

165.#include<iostream> 166.using namespace std; 167.int main() 168.{int a,b,i=20; 169.double c=2,d=1,sum=0; 170.for(a=1;a<=i;a++) 171.{sum=c/d+sum; 172.b=c; 173.c=c+d; 174.d=b; 175.} 176.cout<<"sum="<

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