Final answer:
To subtract mixed numbers, convert them into improper fractions, subtract the fractions, and simplify if necessary.
Step-by-step explanation:
To subtract the given mixed numbers, we need to convert them into improper fractions first.
19/1/2 can be rewritten as (19 x 2 + 1) / 2 = 39/2.
4/ can be rewritten as 4 / 1 = 4.
Now, we can subtract the fractions: 39/2 - 4/1 = (39 - 8) / 2 = 31/2.
Therefore, the answer is 31/2, which can also be expressed as a mixed number in simplest form as 15 1/2.
Learn more about Subtracting mixed numbers