If ${\mathrm{\Delta }}_1=\left|\begin{array}{ccc}1& {\mathrm{a}}^2& {\mathrm{a}}^3\\ 1& {\mathrm{b}}^2& {\mathrm{b}}^3\\ 1& {\mathrm{c}}^2& {\mathrm{c}}^3\end{array}\right|$ and ${\mathrm{\Delta }}_2=\left|\begin{array}{ccc}\mathrm{bc}& \mathrm{b}+\mathrm{c}& 1\\ \mathrm{ca}& \mathrm{c}+\mathrm{a}& 1\\ \mathrm{ab}& \mathrm{a}+\mathrm{b}& 1\end{array}\right|$ Then $\frac{{\mathrm{\Delta }}_1}{{\mathrm{\Delta }}_2}=$

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