The length of a rectangle is 8 decimeters and the width is 3 decimeters. If the length is reduced by 3 decimeters, how much is the area reduced?
一个长方形长8分米，宽3分米，如果长减少3分米，面积减少多少．
<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<result>9</result>