We have a (2/3) hectare experimental field, of which (1/5) hectare is planted with potatoes, and the rest is planted with soybeans. How many hectares are planted with soybeans?
我们有一块(2/3)公顷的试验田，其中(1/5)公顷种土豆，剩下的种大豆，种大豆的面积是多少公顷？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(2/3) - (1/5)</gadget>
<output>7/15 = around 0.466667</output>

<result>7/15 = around 0.466667</result>