22. \( \frac{2}{a b} ; \frac{a-b}{b^{2} c} \)

It appears you're presenting two expressions, possibly for comparison, simplification, or to form a ratio. Let's interpret the problem as finding the ratio of the two expressions: Given: 1. \( \frac{2}{ab} \) 2. \( \frac{a - b}{b^{2}c} \) **Finding the Ratio:** The ratio of the first expression to the second is: \[ \frac{\frac{2}{ab}}{\frac{a - b}{b^{2}c}} = \frac{2}{ab} \times \frac{b^{2}c}{a - b} \] **Simplifying the Expression:** 1. Multiply the numerators and the denominators: \[ = \frac{2 \times b^{2}c}{ab \times (a - b)} \] 2. Simplify by canceling common terms (\(b\)): \[ = \frac{2 \times b \times c}{a \times (a - b)} \] 3. Final simplified form: \[ = \frac{2bc}{a(a - b)} \] **Final Answer:** \[ \frac{2}{ab} : \frac{a - b}{b^{2}c} = \frac{2bc}{\,a(a - b)\,} \]