$$(7.8-7.8 \times 0.2) \div 2$$
$3.12$
$$\frac{7.8-1.56}{2}$$
$$\frac{6.24}{2}$$
$$\frac{624}{200}$$
$$\frac{78}{25}$$
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$\frac{2 \cdot 3 \cdot 13}{5 ^ {2}} = 3\frac{3}{25} = 3.12$