Bună,:)
[tex]a) \frac{3}{4} \times \frac{4}{5} + \frac{1}{5} = \frac{12}{20} + \frac{1}{5} = \frac{3}{5} + \frac{1}{5} = \frac{4}{5} [/tex]
[tex]b) \frac{3}{4} + \frac{4}{5} \times \frac{5}{8} = \frac{3}{4} + \frac{20}{40} = \frac{3}{4} + \frac{2}{4} = \frac{5}{4} [/tex]
[tex]c) ( \frac{5}{6} + \frac{19}{24} ) \times \frac{24}{13} = ( \frac{20}{24} + \frac{19}{24}) \times \frac{24}{13} = \frac{39}{24} + \frac{24}{13} = \frac{936}{312} = \frac{3}{1} [/tex]
[tex]d) \frac{18}{13} \times ( \frac{10}{9} + \frac{1}{3} ) = \frac{18}{3} \times \frac{13}{9} = \frac{6}{1} \times \frac{13}{9} = \frac{78}{9} [/tex]
[tex]e) \frac{12}{35} \times ( \frac{5}{6} - \frac{1}{4} ) = \frac{12}{35} \times \frac{7}{12} = \frac{84}{420} [/tex]
[tex]f) \frac{21}{8} \times( \frac{3}{5} - \frac{1}{3} ) + \frac{4}{15} = \frac{21}{8} \times (\frac{9}{15} - \frac{5}{15} ) + \frac{4}{15} = \frac{21}{8} \times \frac{4}{15} = \frac{21}{30} + \frac{4}{15} = \frac{29}{30} [/tex]
