$$18-4.2\div7+1.3\times0.4$$
$17.92$
$$18-\frac{42}{70}+1.3\times 0.4$$
$$18-\frac{3}{5}+1.3\times 0.4$$
$$\frac{90}{5}-\frac{3}{5}+1.3\times 0.4$$
$$\frac{90-3}{5}+1.3\times 0.4$$
$$\frac{87}{5}+1.3\times 0.4$$
$$\frac{87}{5}+0.52$$
$$\frac{87}{5}+\frac{13}{25}$$
$$\frac{435}{25}+\frac{13}{25}$$
$$\frac{435+13}{25}$$
$$\frac{448}{25}$$
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$\frac{7 \cdot 2 ^ {6}}{5 ^ {2}} = 17\frac{23}{25} = 17.92$
