如何使两个数组中的元素符合条件，Linq c#

using System;
using System.Linq;

class Program
{
    static void Main()
    {
        int[] array1 = { 1, 2, 3, 4, 5 };
        int[] array2 = { 3, 4, 5, 6, 7 };

        var equalPairs = from a in array1
                         from b in array2
                         where a == b
                         select new { a, b };

        foreach (var pair in equalPairs)
        {
            Console.WriteLine($"Pair: {pair.a}, {pair.b}");
        }
    }
}

using System;
using System.Linq;

class Program
{
    static void Main()
    {
        int[] array1 = { 1, 2, 3, 4, 5 };
        int[] array2 = { 5, 6, 7, 8, 9 };

        var pairs = from a in array1
                    from b in array2
                    where a + b == 10
                    select new { a, b };

        foreach (var pair in pairs)
        {
            Console.WriteLine($"Pair: {pair.a}, {pair.b}");
        }
    }
}

var pairs = from a in array1
            from b in array2
            where a * b > 20
            select new { a, b };