The area of a piece of land is (7/8) hectares, of which (1/4) is planted with soybeans, (1/2) is planted with sesame, and the rest is planted with cotton. How many hectares is the area for planting cotton?
一块地的面积是(7/8)公顷，其中(1/4)种黄豆，(1/2)种芝麻，其余的种棉花，种棉花的面积是多少公顷？
<gadget id="calculator">7 / 8</gadget>
<output>7/8 = around 0.875</output>

<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>

<gadget id="calculator">(7/8) * (1/4)</gadget>
<output>7/32 = around 0.21875</output>

<result>7/32 = around 0.21875</result>