The base of a parallelogram is 7cm long. If the base is shortened by 2cm, the area is reduced by 4cm**2. What is the area of the parallelogram in cm**2?
一个平行四边形的底边长7cm，将这条底边缩短2cm后，面积就减少了4cm**2，这个平行四边形的面积是多少cm**2．
<gadget id="calculator">2 / 2</gadget>
<output>1</output>

<gadget id="calculator">7 * 4 * 1</gadget>
<output>28</output>

<result>28</result>