A rectangular piece of cardboard is 12 cm long and 9 cm wide. In this rectangle, if the largest square is cut off, what is the area of the remaining small rectangle?
一张长方形硬纸板长12厘米，宽9厘米．在这个长方形中，剪去一个最大的正方形，剩下的小长方形的面积是多少？
<gadget id="calculator">12 - 9</gadget>
<output>3</output>

<gadget id="calculator">9 * 3</gadget>
<output>27</output>

<result>27</result>