A) \(\frac{5}{9} : \frac{15}{27} = \frac{5}{9} \cdot \frac{27}{15} = \frac{5 \cdot 27}{9 \cdot 15} = \frac{135}{135} = 1\)
Б) \(\frac{15}{53} : \frac{75}{17} = \frac{15}{53} \cdot \frac{17}{75} = \frac{15 \cdot 17}{53 \cdot 75} = \frac{255}{3975} = \frac{17}{265}\)
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