One base of a right-angled trapezoid is 8 decimeters. If the other base is reduced by 2 decimeters, the trapezoid becomes a square. What is the area of the trapezoid in square decimeters?
一个直角梯形的一条底是8分米，如果把另一条底减少2分米，那么这个梯形就变成了一个正方形，则这个梯形的面积是多少平方分米．
<gadget id="calculator">8 + 8 + 2</gadget>
<output>18</output>

<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">18 * 4</gadget>
<output>72</output>

<result>72</result>