А4. Выполнить действие: 1 3/4÷2 4/5

To solve the expression 1 3/4 ÷ 2 4/5:

1. Convert the mixed numbers into improper fractions: 1 3/4 = (4 * 1 + 3) / 4 = 7/4 2 4/5 = (5 * 2 + 4) / 5 = 14/5

2. Invert the second fraction and multiply: (7/4) * (5/14)

3. Simplify the fractions, if possible: (7/4) * (5/14) = (7 * 5) / (4 * 14) = 35/56

Therefore, the answer is 35/56.