There is a square plank, cut off 2 decimeters on its first side and 1 decimeter on the adjacent second side, so that the area of the remaining part is 25 square decimeters less than the original, and the remaining area How many square decimeters?
有一块正方形木板，在它的第一边截去2分米，在相邻的第二边截去1分米，这样剩下部分的面积就比原来的少25平方分米，剩下的面积是多少平方分米？
<gadget id="calculator">9 - 2</gadget>
<output>7</output>

<gadget id="calculator">9 - 1</gadget>
<output>8</output>

<gadget id="calculator">7 * 8</gadget>
<output>56</output>

<result>56</result>