$$( 0 \cdot 05 \times 5 - 0 \cdot 005 \times 5 ) = ?$$
$0$
$$0\times 5\times 5-0\times 0\times 0\times 5\times 5$$
$$0\times 5-0\times 0\times 0\times 5\times 5$$
$$0-0\times 0\times 0\times 5\times 5$$
$$0-0\times 0\times 5\times 5$$
$$0-0\times 5\times 5$$
$$0-0\times 5$$
$$0-0$$
$$0$$
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