piece of land, in which (1/9) grows corn, (4/11) grows vegetables, and the rest grows watermelons. What percentage of the land is planted with watermelons?
一块地，其中(1/9)种玉米，(4/11)种青菜，其余种西瓜．种西瓜的面积占这块地的几分之几？
<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">4 / 11</gadget>
<output>4/11 = around 0.363636</output>

<gadget id="calculator">1 - (1/9) - (4/11)</gadget>
<output>52/99 = around 0.525253</output>

<result>52/99 = around 0.525253</result>