​（方法一：使用函数体）#include<stdio.h>#include<math.h>intt;//t输入这里的t是一个全局变量doubleturn(doublem,doublen,doublea,doublesum,doubleflag);intmain(){doublem,n,a,sum=0,flag=1;//m分子,n分母,a项数,sum和,flag变换符号scanf("%d",