Odpowiedź:
[tex]zad 4.\\a) \frac{3}{5} * \frac{4}{7} = \frac{12}{35} \\\frac{4}{5} * \frac{7}{9} = \frac{28}{45} \\b) \frac{2}{7} * \frac{5}{9} = \frac{10}{63} \\\frac{3}{5} * \frac{11}{8} = \frac{33}{40} \\c) \frac{3}{4} * \frac{13}{17} = \frac{39}{68}\\\frac{1}{4} * \frac{9}{2} = \frac{9}{8} = 1 \frac{1}{8} \\Zad 5.\\a) 1\frac{1}{3}* \frac{2}{5} = \frac{4}{3} * \frac{2}{5} = \frac{8}{15} \\\\b) 4\frac{1}{2} * \frac{3}{4} = \frac{9}{2} * \frac{3}{4} = \frac{27}{8} = 3\frac{3}{8} \\[/tex][tex]c) \frac{5}{7} * 2\frac{3}{4} = \frac{5}{7} * \frac{11}{4} = \frac{55}{28} = 1\frac{27}{28} \\\\d) 2\frac{4}{5}*3\frac{2}{3}=\frac{14}{5} * \frac{11}{3}=\frac{154}{15}=10\frac{4}{15} \\\\e) 1\frac{2}{3}*2\frac{1}{7} = \frac{5}{3}*\frac{15}{7}= \frac{75}{21}=3\frac{12}{21} = 3\frac{4}{7}\\\\f) 3\frac{1}{4}*1\frac{2}{5}=\frac{13}{4}*\frac{7}{5}=\frac{91}{20}=4\frac{11}{20}[/tex]
