[tex]2\frac{2}{9}+1\frac{5}{12}-\frac{7}{8}=2\frac{16}{72}+1\frac{30}{72}-\frac{63}{72}=3\frac{46}{72}-\frac{63}{72}=2\frac{118}{72}-\frac{63}{72}=2\frac{55}{72}\\\\\\3\frac{1}{2}-3\frac{1}{6}:(-2\frac{1}{9})=3\frac{1}{2}-3\frac{1}{6}:(- \frac{19}{9})=3\frac{1}{2}- \frac{19}{6}:(- \frac{19}{9})=\\\\\\=3\frac{1}{2}- \frac{\not{19}^1 }{\not{6}^2}*(- \frac{\not{ 9}^3}{\not{19}^1})= 3\frac{1}{2} +\frac{3}{2}=3\frac{1}{2}+1\frac{1}{2}=5[/tex]
