$\frac{{3,5}^6\cdot 2^6}{{\left(-0,7\right)}^6}={\left(\frac{3,5\cdot 2}{-0,7}\right)}^6={\left(\frac{7}{-0,7}\right)}^6={\left(7:\left(-\frac{7}{10}\right)\right)}^6={\left({\sout{7}}^1\cdot \left(-\frac{10}{{\sout{7}}^1}\right)\right)}^6={\left(-10\right)}^6=1000000$