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determinati fractiile echivalente cu 9 supra 13 , avand numitorul:52,91,169,143.


Răspuns :

 [tex]\frac{^{4)}9}{13}=\frac{4*9}{4*13}=36 \,/ \,52\;;\\
\frac{^{7)}9}{13}=63 \,/\, 91\;;\\
\frac{^{13)}9}{13}=117 \,/\, 169\;;\\
\frac{^{11)}9}{13}=99\,/\,143\;;[/tex]