[tex]a) \frac{2}{7} \div \frac{3}{5} = \frac{2}{7} \times \frac{5}{3} = \frac{10}{21} [/tex]
[tex]b)3 \frac{1}{3} \div 1 \frac{1}{9} = \frac{3 \times 3 + 1}{3} \div \frac{9 \times 1 + 1}{9} = [/tex]
[tex] = \frac{10}{3} \times \frac{9}{10} = \\ = 3[/tex]
[tex]c) \frac{65}{8} \div 4 \frac{1}{16} = [/tex]
[tex] = \frac{65}{8} \div \frac{4 \times 16 + 1}{16} = [/tex]
[tex] = \frac{65}{8} \div \frac{65}{16} = [/tex]
[tex] = \frac{65}{8} \times \frac{16}{65} = \\ = 2[/tex]
[tex]d)1 \div 3 \frac{1}{7} = [/tex]
[tex] = 1 \div \frac{3 \times 7 + 1}{7} = [/tex]
[tex] = 1 \div \frac{22}{7} = \\ = \frac{7}{22} [/tex]
