Odpowiedź:
[tex]a) \frac{2}{5} \div 3 = \frac{2}{5} \times \frac{1}{3} = \frac{2}{15} [/tex]
[tex]b) \frac{4}{7} \div 2 = \frac{4}{7} \times \frac{1}{2} = \frac{2}{7} [/tex]
[tex]c)2 \frac{2}{5} \div 4 = \frac{12}{5} \times \frac{1}{4} = \frac{3}{5} [/tex]
[tex]d) \frac{3}{5} \div \frac{4}{7} = \frac{3}{5} \times \frac{7}{4} = \frac{21}{20} = 1 \frac{1}{20} [/tex]
[tex]e) \frac{6}{7} \div \frac{9}{10} = \frac{6}{7} \times \frac{10}{9} = \frac{2}{7} \times \frac{10}{3} = \frac{20}{21} [/tex]
[tex]f) \frac{8}{7} \div \frac{20}{21} = \frac{8}{7} \times \frac{21}{20} = \frac{4}{1} \times \frac{3}{10} = \frac{12}{10} = 1 \frac{2}{10} = 1 \frac{1}{5} [/tex]