The area of a trapezoid is 1100cm**2, the height is 2.2dm, the lower base is 8.8dm, and the upper base is dm.
一个梯形的面积是1100cm**2，高是2.2dm，下底是8.8dm，上底是多少dm．
<gadget id="calculator">1_100 / 100</gadget>
<output>11</output>

<gadget id="calculator">2 / 2.2</gadget>
<output>0.909091</output>

<gadget id="calculator">11 * 0.909091</gadget>
<output>10.000001</output>

<gadget id="calculator">10.000001 - 8.8</gadget>
<output>1.200001</output>

<result>1.200001</result>