Ответ:

7/9-1/3+5/6=

[tex]\frac{14 - 6 + 15}{18} = \frac{23}{18 } = 1 \frac{5}{18} [/tex]

5/11+2/3+1/9+6/11=

[tex] \frac{5 + 6}{11} + \frac{2}{3} + \frac{1}{9} = 1 + \frac{2}{3} + \frac{1}{9} = \frac{9 + 6 + 1}{9} = \frac{16}{9} = 1 \frac{7}{9} [/tex]