输入三个整数up,down,height
牛牛学梯形
https://ac.nowcoder.com/acm/problem/21995
#include<stdio.h>
int main(){
int up,down,height;
scanf("%d %d %d",&up,&down,&height);
printf("%.3f",height*(up+down)/2.0);//.0
} 
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