C :

#include<stdio.h>


int main()
{
    float a;
    scanf("%f",&a);
    
   
    printf("%6.2f\n",a);
 
    printf("%6.2f %6.2f\n",a,a);
   
    printf("%6.2f %6.2f %6.2f",a,a,a); 
   
}

C++ :

#include<stdio.h>
int main()
{
    float a;
    while(scanf("%f",&a)!=EOF)
    {
        printf("%6.2f\n",a);
        printf("%6.2f %6.2f\n",a,a);
        printf("%6.2f %6.2f %6.2f\n",a,a,a);        
    }
}

Java :

import java.util.Scanner;

public class Main
{
	public static void main(String args[])
	{
		Scanner in=new Scanner(System.in);
		float x=in.nextFloat();
		for(int i=0;i<3;i++)
		{
			for(int j=0;j<=i;j++)
			{
				System.out.printf("%6.2f",x);
				if(j!=i)System.out.print(" ");
			}
			System.out.println();
		}
	}
}

Python :

# coding=utf-8
print("{0:6.2f}\n{0:6.2f} {0:6.2f}\n{0:6.2f} {0:6.2f} {0:6.2f}".format(float(input())))