The problem appears to involve a series of mathematical operations. Translating the expression, it is:

$2.8 \div 2.1 + 2 \frac{1}{3} + 5.2 \div 2.6 \times 0.5$

Step-by-step Solution:

1. Simplify each term:

   • $2.8 \div 2.1 = \frac{28}{21} = \frac{4}{3} = 1.3333$
   • Convert $2 \frac{1}{3}$ to an improper fraction:
     $2 \frac{1}{3} = \frac{7}{3} \approx 2.3333$
   • $5.2 \div 2.6 = 2$
   • $2 \times 0.5 = 1$

2. Combine the results:

   • $1.3333 + 2.3333 + 1 = 4.6666$

Final Answer:

$4.6666 \, \text{or approximately } 4.67$

Would you like more clarification on any step?

5 Related Questions:

1. How do you convert mixed fractions to improper fractions?
2. What are the rules of operations involving division and multiplication?
3. Why is the order of operations important in evaluating expressions?
4. How can such expressions be simplified faster using estimation?
5. How do you handle decimals when simplifying complex equations?

Tip:

Always simplify fractions and decimals early to keep calculations manageable.