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D e a r S t u d e n t a . \frac{4}{9} \div \frac{- 5}{12} = \frac{\frac{4}{9}}{\frac{- 5}{12}} = \frac{4 \times 12}{9 \times - 5} = \frac{4 \times 4}{3 \times - 5} = \frac{16}{- 15} = \frac{- 16}{15} b . 8 \div \frac{- 7}{16} = \frac{8}{\frac{- 7}{16}} = \frac{- 8 \times 16}{7} = \frac{- 128}{7} c . \frac{- 12}{7} \div \frac{- 7}{6} = \frac{\frac{- 12}{7}}{\frac{- 7}{6}} = \frac{- 12 \times 6}{- 7 \times 7} = \frac{72}{49} d . \frac{- 1}{10} \div - 8 = \frac{\frac{- 1}{10}}{- 8} = \frac{- 1}{- 10 \times 8} = \frac{1}{80} e . \frac{- 16}{35} \div \frac{- 15}{4} = \frac{\frac{- 16}{35}}{\frac{- 15}{4}} = \frac{- 16 \times 4}{- 35 \times 15} = \frac{64}{525} R e g a r d s

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