Let's solve the equations shown in the image:

1. $5,078 + 1.2 - 6.003$:

   $5.078 + 1.2 = 6.278$

   $6.278 - 6.003 = 0.275$

   So, the result is 0.275.

2. $5,250 - 3.8 + 2.7$:

   $5.250 - 3.8 = 1.450$

   $1.450 + 2.7 = 4.150$

   So, the result is 4.15.

3. $0.7 - 0.098 + 0.789$:

   $0.7 - 0.098 = 0.602$

   $0.602 + 0.789 = 1.391$

   So, the result is 1.391.

4. $0.20 + 0.1 - 0.299$:

   $0.20 + 0.1 = 0.30$

   $0.30 - 0.299 = 0.001$

   So, the result is 0.001.

Let me know if you would like further details or have any questions!

Here are some related questions you might find interesting:

1. What is the difference between addition and subtraction when it comes to solving equations with decimals?
2. How do decimal places affect the precision of calculations?
3. Can you think of a situation where rounding decimals is more practical?
4. How can we handle subtraction of negative decimals differently?
5. What are some common errors to avoid when adding and subtracting decimals?

Tip: Always line up decimal points when adding or subtracting to avoid mistakes in your calculation.