\[{8,7}^{- 2} + 3^{0} = \left( \frac{87}{10} \right)^{- 2} + 1 =\]
\[= \left( \frac{10}{87} \right)^{2} + 1 = \frac{100}{7569} + 1 =\]
\[= 1\frac{100}{7569}.\]