A rectangular iron plate is 18 decimeters long and 13 decimeters wide. If the length and width are each reduced by 2 decimeters, how many square decimeters will the area be reduced from the original?
一块长方形铁板，长18分米，宽13分米．如果长和宽各减少2分米，面积比原来减少多少平方分米．
<gadget id="calculator">18 * 13</gadget>
<output>234</output>

<gadget id="calculator">18 - 2</gadget>
<output>16</output>

<gadget id="calculator">13 - 2</gadget>
<output>11</output>

<gadget id="calculator">16 * 11</gadget>
<output>176</output>

<gadget id="calculator">234 - 176</gadget>
<output>58</output>

<result>58</result>