In a piece of land, (5/9) is used to grow cabbage, (2/9) is used to grow radishes, and the rest is used to grow vegetables. How much of this land is used for growing vegetables?
一块地，种白菜用去它的(5/9)，种萝卜用去它的(2/9)，其余的种青菜．种青菜用去这块地的几分之几？
<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">1 - (5/9) - (2/9)</gadget>
<output>2/9 = around 0.222222</output>

<result>2/9 = around 0.222222</result>