$$\left. \begin{array} { l } { ( 9 + 12 ) \div 7 + 36 \div 2 \times 30 \div \{ 0 } \\ { 420 \times 4 - 5 \times 10 + 100 \div [ 12 \times 5 - \{ 10 + 8 \times 30 \div ( 2 \times 3 ) \} ] } \end{array} \right.$$
$\text{Indeterminate},\frac{273}{82}$
