The area of a trapezoidal experimental field is 1998 square meters, the upper base is 56 meters, the height is 36 meters, and the lower base is how many meters.
一块梯形实验田的面积是1998平方米，上底是56米，高是36米，下底是多少米．
<gadget id="calculator">2 / 36</gadget>
<output>1/18 = around 0.055556</output>

<gadget id="calculator">1_998 * (1/18)</gadget>
<output>111</output>

<gadget id="calculator">111 - 56</gadget>
<output>55</output>

<result>55</result>