Odpowiedź:
[tex]-\frac{2}3} *\frac{5}{7} =-\frac{10}{21} \\\\1,4*-\frac{9}{14} =\frac{7}{5} *-\frac{9}{14} =-\frac{63}{70} =-\frac{9}{10} \\\\\frac{5}{9} *\frac{3}{7} =\frac{15}{63} =\frac{5}{21}[/tex]
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