kingkuya

All of you forgot...

34-12=22

-3^2=9

9*x=9x (obvious)

you mean "not a terminating number"

81*300=24300m

$${{\mathtt{xi}}}^{{\mathtt{2}}} = {\mathtt{\,-\,}}\left({{\mathtt{x}}}^{{\mathtt{2}}}\right) \Rightarrow \left\{ \begin{array}{l}{\mathtt{xi}} = {\mathtt{\,-\,}}\left({i}{\mathtt{\,\times\,}}{\mathtt{x}}\right)\\ {\mathtt{xi}} = {i}{\mathtt{\,\times\,}}{\mathtt{x}}\\ \end{array} \right\}$$