$${ 79 }^{ 2 } - { 9 }^{ 2 } / { 89 }^{ 2 } - { 9 }^{ 2 }$$
$\frac{48793279}{7921}\approx 6159.989774018$
$$6241-\frac{9^{2}}{89^{2}}-9^{2}$$
$$6241-\frac{81}{89^{2}}-9^{2}$$
$$6241-\frac{81}{7921}-9^{2}$$
$$\frac{49434961}{7921}-\frac{81}{7921}-9^{2}$$
$$\frac{49434961-81}{7921}-9^{2}$$
$$\frac{49434880}{7921}-9^{2}$$
$$\frac{49434880}{7921}-81$$
$$\frac{49434880}{7921}-\frac{641601}{7921}$$
$$\frac{49434880-641601}{7921}$$
$$\frac{48793279}{7921}$$
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$\frac{271 \cdot 401 \cdot 449}{89 ^ {2}} = 6159\frac{7840}{7921} = 6159.989774018432$
