$$\frac { ( 15.7 ) ^ { 2 } - ( 4.4 ) ^ { 2 } } { ( 15.7 + 4.4 ) ^ { 2 } } = ?$$
$\frac{113}{201}\approx 0.562189055$
$$\frac{246.49-4.4^{2}}{\left(15.7+4.4\right)^{2}}$$
$$\frac{246.49-19.36}{\left(15.7+4.4\right)^{2}}$$
$$\frac{227.13}{\left(15.7+4.4\right)^{2}}$$
$$\frac{227.13}{20.1^{2}}$$
$$\frac{227.13}{404.01}$$
$$\frac{22713}{40401}$$
$$\frac{113}{201}$$
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$\frac{113}{3 \cdot 67} = 0.5621890547263682$
