a! ± b! / c!

These problems involve simplifying fractions with factorials. The key is usually to factor out the smallest factorial in the expression.

For example, $\frac{8! + 6!}{7!} = \frac{8 \times 7! + 6!}{7!} = 8 + \frac{6!}{7!} = 8 + \frac{1}{7} = 8\frac{1}{7}$.

Another example: $\frac{3! + 4! - 5!}{3!} = \frac{3!(1 + 4 - (5 \times 4))}{3!} = 1 + 4 - 20 = -15$.