Răspuns:
Explicație pas cu pas:
a) [tex]\frac{15}{4} *\frac{1}{18} =\frac{5}{4} *\frac{1}{6} =\frac{5}{24}[/tex] (simplifici prin 3)
b) [tex]\frac{12}{5} *\frac{7}{16} =\frac{3}{5} * \frac{7}{4}=\frac{21}{20}[/tex] (simplifici prin 4)
c) [tex]\frac{20}{7}*\frac{49}{30}=\frac{2}{7}*\frac{49}{3}=\frac{2}{1}*\frac{7}{3}=\frac{14}{3}[/tex] (simplici prin 10, apoi prin 7)
d) [tex]\frac{5}{21}*\frac{14}{15} =\frac{5}{3} *\frac{2}{15} =\frac{1}{3}*\frac{2}{3} =\frac{2}{9}[/tex] (simplifici prin 7, apoi prin 5)
