$$[(\frac{6}{5}+\frac{1}{6}-\frac{3}{15})-\frac{25}{16}\cdot[(\frac{34}{5}-6)^{3}\cdot(\frac{5}{6}:\frac{2}{3})^{2}]^{2}$$
$$[81-315-2516*[339^3*(56:23)^2]^2$$
