Question

nhanh dùm ạ, giúp em

Answer 1

em sắp tiêu rồi ạ huhuh

Answer 2

1:

#include <bits/stdc++.h>

using namespace std;

double a,b;

int main()

{

cin>>a>>b;

cout<<fixed<<setprecision(2)<<2*(a+b)<<endl;

cout<<fixed<<setprecision(2)<<a*b;

return 0;

}