A pesticide is prepared by mixing liquid medicine and water at a ratio of 1:1500. To prepare 750.5 kg of this pesticide, how many kilograms of liquid medicine is needed.
一种农药由药液和水按照1：1500配制而成，配制该农药750.5千克，需要药液多少千克．
<gadget id="calculator">1_500 + 1</gadget>
<output>1_501</output>

<gadget id="calculator">1 / 1_501</gadget>
<output>1/1_501 = around 0.000666</output>

<gadget id="calculator">750.5 * (1/1_501)</gadget>
<output>0.5</output>

<result>0.5</result>