Bài giải:

$A=\frac{\left(\frac{13}{84}\times1\frac{2}{5}-2\frac{1}{2}\times\frac{7}{180}\right):2\frac{7}{18}+4\frac{1}{2}\times \frac{1}{10}}{70\frac{1}{2}-528:7\frac{1}{2}}$

$=\frac{\left(\frac{13}{84}\times\frac{7}{5}-\frac{5}{2}\times\frac{7}{180}\right):\frac{43}{18}+\frac{9}{2}\times \frac{1}{10}}{\frac{141}{2}-528:\frac{15}{2}}$

$=\frac{\left(\frac{13}{60}-\frac{7}{72} \right):\frac{43}{18}+\frac{9}{20}}{\frac{141}{2}-528\times \frac{2}{15}}$

$=\frac{\frac{43}{360}\times\frac{18}{43}+\frac{9}{20}}{\frac{141}{2}-\frac{352}{5}}$

$=\frac{\frac{1}{20}+\frac{9}{20}}{\frac{1}{10}}$

_{$=\frac{1}{2}:\frac{1}{10}=5$}