The area of a triangle is 40 square centimeters, its base is 5 decimeters, and its height is decimeters.
三角形的面积是40平方厘米，它的底是5分米，高是多少分米．
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) * (2/5)</gadget>
<output>4/25 = around 0.16</output>

<result>4/25 = around 0.16</result>