Cut off a strip of wood with a width of 3 decimeters from a square plank, and the area of the remaining plank is 72 square decimeters larger than that of the cut plank, what is the area of the remaining plank in square decimeters?
从一块正方形木板上截下一块宽为3分米的木条，剩下木板比截掉的木板面积多72平方分米，剩下的木板面积是多少平方分米．
<gadget id="calculator">9 + 3</gadget>
<output>12</output>

<gadget id="calculator">9 * 12</gadget>
<output>108</output>

<result>108</result>