How many square decimeters of cardboard are needed to make a cuboid carton with a length of 4.5 decimeters, a width of 5 decimeters, and a height of 4 decimeters without a cover?
用硬纸板做一个长4.5分米，宽5分米，高4分米的无盖的长方体纸箱，至少需要多少平方分米硬纸板？
<gadget id="calculator">4.5 * 5</gadget>
<output>22.5</output>

<gadget id="calculator">4.5 * 4 * 2</gadget>
<output>36</output>

<gadget id="calculator">5 * 4 * 2</gadget>
<output>40</output>

<gadget id="calculator">22.5 + 36 + 40</gadget>
<output>98.5</output>

<result>98.5</result>