Răspuns:
Explicație pas cu pas:
a). [tex](\frac{12}{25} :\frac{4}{5} ):\frac{9}{35} = (\frac{12}{25} *\frac{5}{4} ):\frac{9}{35} =\frac{3}{5} :\frac{9}{35} =\frac{3}{5} *\frac{35}9} =\frac{7}{3}[/tex]
b). [tex]\frac{12}{25} :(\frac{4}{5} :\frac{9}{35} )=\frac{12}{25} :(\frac{4}{5} *\frac{35}9} )=\frac{12}{25} :\frac{28}{9} =\frac{12}{25} *\frac{9}{14} =\frac{27}{175}[/tex]
c). [tex](\frac{25}{36} :\frac{7}{16} ):(\frac{60}{49} :\frac{162}{7} )=(\frac{25}{36} *\frac{16}{7} ):(\frac{60}{49} *\frac{7}{162} )=(\frac{25}{18} *\frac{8}{7} ):(\frac{30}{7} *\frac{1}{81} )=\frac{200}{126} :\frac{30}{567} =30[/tex]
d). [tex](\frac{11}{12} :\frac{13}{18} ):\frac{22}{33} =(\frac{11}{12} *\frac{18}{13} ):\frac{22}{33} =\frac{1}{13} *\frac{11}{1} =\frac{11}{13}[/tex]
e). ([tex](\frac{19}{45} :\frac{7}{30} ):\frac{19}{21} =(\frac{19}{45} *\frac{30}7} ):\frac{19}{21} =\frac{38}{21} :\frac{19}{21} =\frac{38}{21} *\frac{21}{19} =\frac{38}{19}[/tex]
f). [tex](\frac{13}{12} :\frac{7}{15} ):\frac{39}{70} =(\frac{13}{12}*\frac{15}{7} ):\frac{39}{70} =\frac{65}{28} :\frac{39}{70} =\frac{65}{28} *\frac{70}{39} =\frac{65}{2} *\frac{5}{39} =\frac{325}{78}[/tex]
