The area of a trapezoid is 25dm**2, the upper base is 4.8dm, the lower base is 5.2dm, what is the height?
一个梯形的面积是25dm**2，上底是4.8dm，下底是5.2dm，高是多少．
<gadget id="calculator">4.8 + 5.2</gadget>
<output>10</output>

<gadget id="calculator">2 / 10</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">25 * (1/5)</gadget>
<output>5</output>

<result>5</result>