Answer
[tex]a) \frac{4}{7} \div 1 \frac{3}{4} \\ \frac{4}{7} \div \frac{7}{4} \\ = \frac{4}{7} \times \frac{4}{7} \\ = \frac{16}{49} [/tex]
[tex]b)5 \frac{3}{5} \div 2 \frac{2}{3} \\ \frac{28}{5} \div \frac{8}{3} \\ \frac{28}{5} \times \frac{3}{8} \\ = \frac{21}{10} \\ = 2 \frac{1}{10} [/tex]
hope this helps
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