$$( 800 \cdot 500 - 100 \cdot 70 - 30 \cdot 20 )$$
$392400$
$$400000-100\times 70-30\times 20$$
$$400000-7000-30\times 20$$
$$393000-30\times 20$$
$$393000-600$$
$$392400$$
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$2^{4}\times 3^{2}\times 5^{2}\times 109$
