A cuboid stone with a length of 9dm, a width of 30cm and a height of 5dm is the maximum area dm**2.
一块长9dm，宽30cm，高5dm的长方体石块最多占地面积是多少dm**2．
<gadget id="calculator">9 * 5</gadget>
<output>45</output>

<result>45</result>