Salut!
a) [tex]\frac{1}{5} * \frac{1}{4} = \frac{1*1}{5*4} = \frac{1}{20}[/tex]
b) [tex]\frac{3}{7} * \frac{2}{11} = \frac{3*2}{7*11} = \frac{6}{77}[/tex]
c) [tex]\frac{3}{8} * \frac{5}{6} = \frac{3*5}{8*6} = \frac{15}{48}[/tex]
d) [tex]\frac{5}{9} * \frac{3}{4} = \frac{5*3}{9*4} = \frac{15}{36}[/tex]
e) [tex]\frac{7}{15} * \frac{5}{14} = \frac{7*5}{15*14} = \frac{35}{210}[/tex]
f) [tex]\frac{5}{6} * \frac{3}{?} = \frac{5*3}{6*?} = \frac{15}{6*?}[/tex], unde "?" este numarul care nu se vede.
Succes!
