4 1/3:(5/6+0,25)-3.6 (7/12+1.9)

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To solve this expression, we need to follow the order of operations (PEMDAS):

First, simplify the expressions within the parentheses:
5/6 + 0.25 = 5/6 + 1/4
To add these fractions, we need to find a common denominator, which in this case is 12.
5/6 = 10/12
10/12 + 3/12 = 13/12

7/12 + 1.9 = 7/12 + 1.9 (convert 1.9 to a fraction)
7/12 + 19/10 = 35/60 + 114/60 = 149/60

Now we have:
4 1/3 : (13/12) - 3.6 (149/60)

Next, perform the division and subtraction inside the parentheses:
4 1/3 = 13/3
13/3 divided by 13/12 = 13/3 12/13 = 4
4 - 3.6 (149/60) = 4 - 3.6 149/60 = 4 - 89.4/60 = 4 - 1.49 = 2.51

Therefore, 4 1/3 : (5/6 + 0.25) - 3.6 (7/12 + 1.9) = 2.51