$$( \sqrt [ 4 ] { 81 } ) ( \sqrt { 3 } ) ( \sqrt { 20 } ) ( \sqrt { 5 } ) ( \sqrt { 75 } )$$
$450$
$$\sqrt[4]{81}\sqrt{3}\sqrt{20}\sqrt{5}\sqrt{3}\sqrt{25}$$
$$\sqrt[4]{81}\times 3\sqrt{20}\sqrt{5}\sqrt{25}$$
$$\sqrt[4]{81}\times 3\sqrt{5}\sqrt{4}\sqrt{5}\sqrt{25}$$
$$\sqrt[4]{81}\times 3\times 5\sqrt{4}\sqrt{25}$$
$$3\times 3\times 5\sqrt{4}\sqrt{25}$$
$$9\times 5\sqrt{4}\sqrt{25}$$
$$45\sqrt{4}\sqrt{25}$$
$$45\times 2\sqrt{25}$$
$$90\sqrt{25}$$
$$90\times 5$$
$$450$$
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$2\times 3^{2}\times 5^{2}$
