A new batch of garbage bins is added in the amusement park, which is composed of two cubes, the edge length of the small cube is 2dm, and the edge length of the big cube is 5dm. The top of the small cube is open, which is convenient for people to throw garbage. How many square decimeters of iron sheet is needed to make such a dustbin? (Hint: subtract three 2*2 areas!)
游乐园里新增了一批垃圾箱，它是由两个正方体组成的，其中小正方体的棱长是2dm，大正方体的棱长是5dm．小正方体的顶部敞开，便于人们扔垃圾．制作这样一个垃圾箱，至少需要多少平方分米的铁皮？(提示：要减去3个2*2的面积哟！)
<gadget id="calculator">5 * 5 * 6</gadget>
<output>150</output>

<gadget id="calculator">2 * 2 * 3</gadget>
<output>12</output>

<gadget id="calculator">150 + 12</gadget>
<output>162</output>

<result>162</result>