[tex]\displaystyle 1). \frac{5}{12} + \frac{7}{10} = \frac{25}{60} + \frac{42}{60} = \frac{67}{60} \\ \\ 2).1,3+2,(5)= \frac{13}{10} + \frac{23}{9} = \frac{117}{90} + \frac{230}{90} = \frac{347}{90} \\ \\ 3).2: \left(\begin{ \frac{2}{3} }{}&&\\&&\\&&\end{array}\right) ^2+ \frac{11}{5} : \frac{11}{10} =2: \frac{4}{9} + \frac{11}{5} \cdot \frac{10}{11} =2 \cdot \frac{9}{4} + \frac{110}{55} = \\ \\ = \frac{18}{4} + \frac{110}{55} = \frac{990}{220} + \frac{440}{220} = \frac{1430}{220} = \frac{13}{2} [/tex]
[tex]4).Doua~numere~rationale~aflate~intre~-3,4~si~-3,5~sunt \\ -3,42 ~si~-3,47.[/tex]
