181.
Simplify 5⁄2 ÷ 1⁄x
Answer: A
Dividing by a fraction means multiplying by its reciprocal.
\[ \frac{5}{2} \div \frac{1}{x} = \frac{5}{2} \times \frac{x}{1} = \frac{5x}{2} \]
The reciprocal of \( \tfrac{1}{x} \) is \( x \), so the \( x \) moves to the numerator.
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