Adding Fractions:
When adding fractions, you need to find a common denominator before adding the fractions together. In this case, the denominators are 4, 2, and 5. The least common multiple of 4, 2, and 5 is 20.

Converting Fractions to Have a Common Denominator:
To convert 3/4 to have a denominator of 20, we multiply both the numerator and denominator by 5, resulting in 15/20. To convert 1/2 to have a denominator of 20, we multiply both the numerator and denominator by 10, resulting in 10/20. Lastly, 6/5 already has a denominator of 5, so we don't need to make any changes.

Adding the Fractions:
Now that all fractions have a common denominator of 20, we can add them together.
1f 3/4 + 1/2 + 6/5 becomes 15/20 + 10/20 + 24/20, which equals 49/20.

Expressing the Answer:
Therefore, the value of 1f 3/4 + 1/2 + 6/5 is 49/20.
This can also be expressed as a mixed number, which is 2 9/20.
So, 1f 3/4 + 1/2 + 6/5 is equal to 49/20 or 2 9/20.