Order of Operations with Parentheses

$4+(6:2)=$
In this exercise, we will start by solving the operation inside the parentheses, and then the rest:
$4+(6:2)=4+(3)= 4+3 = 7$

$5+8\cdot3-(8:4)=$
We'll start by solving the operation inside the parentheses:
$5+8\cdot3-2=$
Next, we continue with the multiplications:
$5+24-2=$
Finally, we add and subtract:
$5+24-2=27$

$1+9\cdot15-(9:3)=$
We'll start by solving the operation inside the parentheses:
$1+9\cdot15-3=$
Next, we continue with the multiplications:
$1+135-3=$
Finally, we add and subtract:
$1+135-3=133$

$(21+3)\cdot2\operatorname{\cdot}4-(22:2)=$

We will start by solving the operation inside the parentheses:
$24\cdot2\operatorname{\cdot}4-11=$

Next, we continue with the multiplications:
$48\operatorname{\cdot}4-11=$

$192-11=$

Finally, we add and subtract:
$192-11=181$

$(1+9)+(15\cdot8)-(8:2)=$

Let's start by solving the operation inside the parentheses:
$(10)+(120)-(4)=$

Finally, we add and subtract:
$10+120-4=126$

That is, the order in all exercises will be as follows:

1. Parentheses
2. Exponents and roots
3. Multiplications and divisions
4. Additions and subtractions

Reminder: when an exercise includes operations that have the same precedence, that is, multiplication and division or addition and subtraction, we will solve the exercise from left to right.