[tex]k)\frac{5}{8}x 4,2 - \frac{1}{4} = \frac{5}{8} x\frac{21}{5} -\frac{1}{4} = \frac{1}{8} x 21 - \frac{1}{4} = \frac{21}{8} - \frac{1}{4} = \frac{19}{8}[/tex]
[tex]l) \frac{4}{7} x (0,2 + \frac{1}{4}) = \frac{4}{7} x (\frac{1}{5} + \frac{1}{4} ) = \frac{4}{7} x \frac{9}{20} = \frac{1}{7} x \frac{9}{5} = \frac{9}{35}[/tex]
[tex]Pozdrawiam[/tex] [tex]serdecznie :)[/tex]
