how to calculate (5-1)(2.9155)^2+(6-1)*(2.0976)^2/5+6-2 should = 6.22222

$${\left(\left({\mathtt{5}}{\mathtt{\,-\,}}{\mathtt{1}}\right){\mathtt{\,\times\,}}{\mathtt{2.915\: \!5}}\right)}^{{\mathtt{2}}}{\mathtt{\,\small\textbf+\,}}{\frac{\left({\mathtt{6}}{\mathtt{\,-\,}}{\mathtt{1}}\right){\mathtt{\,\times\,}}{\left({\mathtt{2.097\: \!6}}\right)}^{{\mathtt{2}}}}{{\mathtt{5}}}}{\mathtt{\,\small\textbf+\,}}{\mathtt{6}}{\mathtt{\,-\,}}{\mathtt{2}} = {\mathtt{144.402\: \!169\: \!76}}$$

You probably should have brackets somewhere.