In a piece of land, (1/4) is planted with eggplants, (2/7) is planted with cucumbers, and the rest is planted with tomatoes. What is the area of the tomatoes?
一块地，它的(1/4)种茄子，(2/7)种黄瓜，其余种西红柿，西红柿的面积有多少？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">1 - (1/4) - (2/7)</gadget>
<output>13/28 = around 0.464286</output>

<result>13/28 = around 0.464286</result>