The area of a triangle is 10m**2, the base is 5m, and the height is in meters.
一个三角形的面积是10m**2，底是5m，高是多少米．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">10 * (2/5)</gadget>
<output>4</output>

<result>4</result>