The area of a rectangle is 1 square meter, its width is (1/5) meter, and its length is in meters.
一个长方形的面积是1平方米，它的宽是(1/5)米，长是多少米．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 / (1/5)</gadget>
<output>5</output>

<result>5</result>