In a piece of land, (2/9) of them are tomatoes, and (5/9) of them are of cucumbers. What fraction of the land is planted with tomatoes and cucumbers?
一块地，其中的(2/9)种西红柿，其中的(5/9)种黄瓜．种西红柿和种黄瓜的部分一共占这块地的几分之几？
<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">(2/9) + (5/9)</gadget>
<output>7/9 = around 0.777778</output>

<result>7/9 = around 0.777778</result>