A piece of land (7/8) hectares, of which (1/4) is planted with soybeans, (1/2) is planted with cotton, and the rest is planted with corn. What is the planting area of corn in this land?
一块地(7/8)公顷，其中(1/4)种大豆，(1/2)种棉花，其余种玉米，玉米的种植面积占这块地的多少
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 - (1/4) - (1/2)</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>