$$4.2 \times 13.5-8.7 \times 4.2-5.8 \times 8.7+13.5 \times 5.8$$
$48$
$$56.7-8.7\times 4.2-5.8\times 8.7+13.5\times 5.8$$
$$56.7-36.54-5.8\times 8.7+13.5\times 5.8$$
$$20.16-5.8\times 8.7+13.5\times 5.8$$
$$20.16-50.46+13.5\times 5.8$$
$$-30.3+13.5\times 5.8$$
$$-30.3+78.3$$
$$48$$
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$3\times 2^{4}$
