The area of a piece of land is (5/7) hectares, (1/2) is planted with tomatoes, (1/14) is planted with green peppers, and the rest are planted with cucumbers. What percentage of the land is planted with cucumbers?
一块地的面积有(5/7)公顷，(1/2)种番茄，(1/14)种青椒，其余种黄瓜．黄瓜种了这块地的几分之几？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 14</gadget>
<output>1/14 = around 0.071429</output>

<gadget id="calculator">1 - (1/2) - (1/14)</gadget>
<output>3/7 = around 0.428571</output>

<result>3/7 = around 0.428571</result>