计算下面各题，能简算的要简算。
$\frac{7}{9}÷\frac{1}{8}+\frac{1}{9}$
$\frac{3}{8}×\frac{22}{51}÷\frac{33}{17}$
$10÷\frac{5}{9}+\frac{1}{8}×6$
$\frac{7}{12}×\frac{10}{11}÷\frac{21}{22}$
$\frac{7}{8}÷63÷\frac{2}{9}$
$\frac{6}{13}×\frac{8}{17}+\frac{6}{13}÷\frac{17}{18}$
$(\frac{1}{4}+\frac{4}{9})÷\frac{1}{36}$
$\frac{5}{9}÷5+5÷\frac{5}{9}$
$17×(\frac{2}{17}+\frac{3}{19})×19$
$(\frac{3}{7}+\frac{2}{3})÷\frac{1}{21}$
$\frac{26}{11}-(\frac{1}{3}÷\frac{11}{12}÷\frac{1}{5})$
$\frac{8}{9}÷[(\frac{1}{2}+\frac{1}{6})÷\frac{3}{4}]$
$\frac{7}{36}÷\frac{11}{12}÷\frac{5}{33}$
$4.8×\frac{5}{7}+1.5÷\frac{7}{5}$
$\frac{15}{16}÷[\frac{3}{2}÷(1-\frac{2}{5})]$

1. $\frac{19}{3}$
2. $\frac{1}{12}$
3. $\frac{75}{4}$
4. $\frac{5}{9}$
5. $\frac{1}{16}$
6. $\frac{12}{17}$
7. 25
8. $9\frac{1}{9}$
9. 89
10. 23
11. $\frac{6}{11}$
12. 1
13. $\frac{7}{5}$
14. $\frac{9}{2}$
15. $\frac{3}{8}$