$${\sqrt[{{\mathtt{{\mathtt{4}}}}}]{-{\mathtt{81}}}} = {\mathtt{3}}{\mathtt{\,\times\,}}{\sqrt[{{\mathtt{{\mathtt{4}}}}}]{-{\mathtt{1}}}}$$
$${\frac{{\mathtt{69}}}{{\mathtt{0}}}} = \underset{{\tiny{\text{Error: DivByZero}}}}{{\frac{{\mathtt{69}}}{{\mathtt{0}}}}}$$
$${\mathtt{30}}{\mathtt{\,\times\,}}{{\mathtt{10}}}^{-{\mathtt{6}}} = {\mathtt{0.000\: \!03}}$$
$${{\mathtt{10}}}^{-{\mathtt{6}}} = {\mathtt{0.000\: \!001}}$$ $${{\mathtt{10}}}^{-{\mathtt{6}}} = {\frac{{\mathtt{1}}}{{{\mathtt{10}}}^{{\mathtt{6}}}}}$$