### 1
```
var sorted = phones.OrderBy(x => x.title).ThenByDescending(x => x.price);
foreach (var a in sorted)
{
    Console.WriteLine(a.title +" - "+ a.price);
}
```

```
Iphone 15 Pro Max - 139000
Iphone SE 2020 - 24000
Iphone X - 32000
Nokia 3310 - 2000
Samsung Galaxy S24 - 90000
Samsung Z Fold5 - 65000
Xiaomi 12T Pro - 60000

```

### 2
```
var averageprice = phones.Select(u =>u.price).Average();
Console.WriteLine(averageprice);
```

```
58857,142857142855
```

### 3
```
var sorted = phones.Where(u => u.title.StartsWith("Samsung"));
foreach (var a in sorted)
{
    Console.WriteLine(a.title);
}

Console.WriteLine();

var sorted2 = phones.Where(u => u.title.StartsWith("Iphone"));
foreach (var a in sorted2)
{
    Console.WriteLine(a.title);
}
```

```
Samsung Galaxy S24
Samsung Z Fold5

Iphone SE 2020
Iphone 15 Pro Max
Iphone X
```

### 4
```
var phoneslist = phones.OrderBy(x => x.price);
foreach (var x in phoneslist)
{
    Console.WriteLine(x.title +" - "+ x.price);
}
```

```
Nokia 3310 - 2000
Iphone SE 2020 - 24000
Iphone X - 32000
Xiaomi 12T Pro - 60000
Samsung Z Fold5 - 65000
Samsung Galaxy S24 - 90000
Iphone 15 Pro Max - 139000
```

### 5
```
var newlist = phones.Where(u => u.price < 50000).Select(u => u);
Console.WriteLine("Смартфоны дешевле 50000:");
foreach (var a in newlist)
{
    Console.WriteLine(a.title +"-"+ a.price);
}
```

```
Смартфоны дешевле 50000:
Iphone SE 2020-24000
Nokia 3310-2000
Iphone X-32000
```