(21,7 : 6,2 - 11: 4,4)*3/4

To solve the expression (21,7 : 6,2 - 11: 4,4) * 3/4, we will go step by step according to the order of operations (PEMDAS/BODMAS: Parentheses/Brackets, Exponents/Orders, Multiplication/Division, Addition/Subtraction).

First, we do the divisions inside the parentheses:

21,7 : 6,2 = 21.7 / 6.2 and 11 : 4,4 = 11 / 4.4

21.7 / 6.2 ≈ 3.5 (rounded to one decimal place) 11 / 4.4 ≈ 2.5 (rounded to one decimal place)

The expression now becomes:

(3.5 - 2.5) * 3/4

Next, we do the subtraction inside the parentheses:

3.5 - 2.5 = 1.0

The expression now becomes:

1.0 * 3/4

Now we do the multiplication:

1.0 * (3/4) = 1.0 * 0.75 = 0.75

The final result of the expression is 0.75.