[tex] (\frac{28}{10} + \frac{15}{9} ) : ( \frac{183}{90} + \frac{1}{5})~se~aduc~la~un~numitor~comun \\ (\frac{252}{90} + \frac{150}{90}): ( \frac{183}{90} + \frac{18}{90} ) \\ \frac{402}{90} : \frac{201}{90} \\ \frac{402}{90}* \frac{90}{201}~se~simplifica~ \\ \frac{2}{1}=2 [/tex]
