$$(\frac{1}{3})^{-2}+(\frac{1}{4})^{-2}+(\frac{1}{5})^{-2}$$
$50$
$$9+\left(\frac{1}{4}\right)^{-2}+\left(\frac{1}{5}\right)^{-2}$$
$$9+16+\left(\frac{1}{5}\right)^{-2}$$
$$25+\left(\frac{1}{5}\right)^{-2}$$
$$25+25$$
$$50$$
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$2\times 5^{2}$
