a)
[tex](3 \frac{3}{5} + 2 \frac{4}{5} ) \div \frac{6}{7} = 5 \frac{7}{5} \div \frac{6}{7} = \frac{32}{5} \times \frac{7}{6} = \frac{224}{30} = 7 \frac{14}{30} = 7 \frac{7}{15} [/tex]
b)
[tex] \frac{3}{4} \div 4 \frac{1}{2} + 7 \div 1 \frac{1}{6} = \frac{3}{4} \div \frac{9}{2} + \frac{7}{1} \div \frac{7}{6} = \frac{3}{4} \times \frac{2}{9} + \frac{7}{1} \times \frac{6}{7} = \frac{1}{2} \times \frac{1}{3} + \frac{1}{1} \times \frac{6}{1} = \frac{1}{6} + \frac{6}{1} = 1[/tex]
c)
[tex] \frac{3}{5} \div (1 \frac{1}{2} - \frac{3}{4} ) = \frac{3}{5} \div (1 \frac{2}{4} - \frac{3}{4} ) = \frac{3}{5} \div ( \frac{6}{4} - \frac{3}{4} ) = \frac{3}{5} \div \frac{3}{4} = \frac{3}{5} \times \frac{4}{3} = \frac{1}{5} \times \frac{4}{1} = \frac{4}{5} [/tex]
Myślę że pomogłem ;)
