$$19KM.56M-12KM.5M$$
$\frac{116KM^{2}}{25}$
$$19KM^{2}\times 0.56-12KM\times 0.5M$$
$$19KM^{2}\times 0.56-12KM^{2}\times 0.5$$
$$10.64KM^{2}-12KM^{2}\times 0.5$$
$$10.64KM^{2}-6KM^{2}$$
$$4.64KM^{2}$$
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$\frac{116M^{2}}{25}$