The problem requires solving two complex arithmetic expressions involving mixed numbers, fractions, addition, subtraction, multiplication, and division.
Expression 1:
Part 1: (12 5/12 + 1 2/3 - 3 5/6 + 2 3/4)
Convert mixed numbers to improper fractions:
12 5/12 = (12*12 + 5)/12 = 149/12
1 2/3 = (1*3 + 2)/3 = 5/3
3 5/6 = (3*6 + 5)/6 = 23/6
2 3/4 = (2*4 + 3)/4 = 11/4
Find a common denominator for 12, 3, 6, and 4, which is 12.
Apply order of operations (PEMDAS/BODMAS): Parentheses/Brackets, Exponents/Orders, Multiplication and Division (from left to right), Addition and Subtraction (from left to right).