$$=1+0.00100; 1000\ x=1+x; 1000x=-x=1; 999x=1$$
$1.001$
$$1.001$$
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$\frac{7 \cdot 11 \cdot 13}{2 ^ {3} \cdot 5 ^ {3}} = 1\frac{1}{1000} = 1.001$
