Uncle Wang reclaimed 8,000 square meters of dry land, of which (1/2) hectares were planted with rape, (1/5) hectares were planted with soybeans, and the rest were planted with corn. How many hectares of cornfield?
王大爷开垦了8000平方米的旱地，其中(1/2)公顷种油菜，(1/5)公顷种大豆，其余的种玉米．玉米地占多少公顷？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">0.8 - (1/2) - (1/5)</gadget>
<output>0.1</output>

<result>0.1</result>