题解 | #牛牛学梯形#
牛牛学梯形
https://ac.nowcoder.com/acm/contest/18839/1026
#include<bits/stdc++.h>
using namespace std;
int main()
{
double a,b,c;
cin>>a>>b>>c;
double d=(a+b)*c/2;
cout<<fixed<<setprecision(3)<<d<<endl;
}
牛牛学梯形
https://ac.nowcoder.com/acm/contest/18839/1026
#include<bits/stdc++.h>
using namespace std;
int main()
{
double a,b,c;
cin>>a>>b>>c;
double d=(a+b)*c/2;
cout<<fixed<<setprecision(3)<<d<<endl;
}
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