Question

Simplify:

\[\left\{ 3^{- 1} \times 4^{- 1} \right\}^{- 1} \times 5^{- 1}\]

Answer 1

\[\left\{ 3^{- 1} \times 4^{- 1} \right\}^{- 1} \times 5^{- 1}\]`-(1/3xx1/4)^(-1)xx1/5`     → (a⁻¹ = 1/a)

\[= \left( \frac{1}{12} \right)^{- 1} \times \frac{1}{5}\]

\[= 12 \times \frac{1}{5}\]  → (a⁻¹ = 1/a)

\[= \frac{12}{5}\]