8831. Value of expression 1

Compute the value of the expression for the given real numbers x and y.

Input. Two real numbers x and y.

Output. Print the value of the given expression with precision to the thousandths.

Sample input	Sample output
1.000 -2.000	21.857

SOLUTION

mathematics

Algorithm analysis

To solve the problem, compute the value of the given expression.

Algorithm implementation

Read the input data.

scanf("%lf %lf", &x, &y);

Compute the value of the expression in the variable z.

z = 2 * x * x - 4 * x * y + 3 * y * y + (x + y) / 7;

Print the answer with precision to the thousandths.

printf("%.3lf\n", z);

Java implementation

import java.util.*;

public class Main

{

public static void main(String[] args)

{

Scanner con = new Scanner(System.in);

double x = con.nextDouble();

double y = con.nextDouble();

double z = 2 * x * x - 4 * x * y +3 * y * y + (x + y) / 7;

System.out.println(z);

con.close();

}

}

Python implementation

Read the input data.

x, y = map(float, input().split())

Compute the value of the expression in the variable z.

z = 2 * x * x - 4 * x * y + 3 * y * y + (x + y) / 7;

Print the answer.

print(z)