Python:

a,b = map(int,input().strip().split())
perimeter = (a+b)*2
area = a*b
print(f"{perimeter:.2f} {area:.2f}")

参考答案：

#include<iostream>

using namespace std;

int main()
{
    double a, b;
    cin >> a >> b;

    printf("%.2lf %.2lf", (a + b) * 2, a * b);

    return 0;
}