Resposta:
[tex]\frac{7}{9}~.~ \frac{5}{14} ~.~\frac{3}{20} =\frac{7~.~5~.~3}{9~.~14~.~20} =\frac{105}{2520} \\ \\ simplifique~dividindo~numerador~e~denominador~por~105\\ \\ \\ \frac{105}{2520}= \frac{1}{24}[/tex]
