7) -1/4 * 3/4 =

The problem asks to multiply a negative fraction by a positive fraction: \(-\frac{1}{4} \times \frac{3}{4}\).

1. Multiply the numerators: \(-1 \times 3 = -3\)
2. Multiply the denominators: \(4 \times 4 = 16\)
3. Combine the results: The resulting fraction is \(\frac{-3}{16}\).

Ответ: \(-\frac{3}{16}\)