Rezolvatie ecuatiile 11 intregi si 5 pe 12 + 7 intregi si 7 pe 18
8 intregi si 8 pe 15 + 5 intregi si 7 pe 30
9 integi si 3 pe 30 + 4 intregi si 11 pe 30

[tex]11 \frac{5}{12} +7 \frac{7}{18} = \\\\\frac{11*12+5}{12}+ \frac{7*18+7}{18} =\\\\ \frac{137}{12}+ \frac{133}{7}= \frac{7*137}{7*12}+ \frac{12*133}{12*7}=\\\\ \frac{959+2555}{84}=41.8(3) [/tex] 

[tex] 8\frac{8}{15}+5 \frac{7}{30} = \\\\\frac{8*15+8}{15} + \frac{5*30+7}{30} \\\\ \frac{128}{15}+ \frac{17}{30}= \frac{128*2+17}{30}=\\\\ \frac{273}{30}= \frac{91}{10}=9.1 [/tex]


[tex]9 \frac{3}{30} +4 \frac{11}{30} =\\\\ \frac{9*30+3}{30}+ \frac{4*30+11}{30} =\\\\ \frac{183+131}{30}=\\\\ \frac{314}{30} =10.46[/tex]