Grouping Conditions in PHP

Although the and operation has precedence over or, it is often more convenient to use grouping parentheses to explicitly show the precedence of operations:

php<?php
  $num = 3;
  
  if ( ($num > 0 and $num < 5) or ($num > 10 and $num < 20) ) {
    echo '+++';
  } else {
    echo '---';
  }
?>

Of course, grouping can also be used in the case when you need your own priority of operations, and not the one that is obtained by default.

Задание 1

In the code below, specify the priority of operations explicitly:

php<?php
  $num = 3;
    
  if ($num > 5 and $num < 10 or $num == 20) {
    echo '+++';
  } else {
    echo '---';
  }
?>

Задание 2

In the code below, specify the priority of operations explicitly:

php<?php
  $num = 3;
    
  if ($num > 5 or $num > 0 and $num < 3) {
    echo '+++';
  } else {
    echo '---';
  }
?>

Задание 3

In the code below, specify the priority of operations explicitly:

php<?php
  $num = 3;
    
  if ($num == 9 or $num > 10 and $num < 20 or $num > 20 and $num < 30) {
    echo '+++';
  } else {
    echo '---';
  }
?>