$$\left. \begin{array} { l } { 30.9 - 3.09 } \\ { + \quad 0.309 } \\ { - \quad 0.0319 } \end{array} \right.$$
$-0.0319,0.309,27.81$
$$sort(27.81,0.309,-0.0319)$$
$$27.81$$
$$0.309,27.81$$
$$-0.0319,0.309,27.81$$
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$27.81,\ 0.309,\ -0.0319$
