Xiao Ming’s birthday is today, and his classmates gave him 2 photo albums. Each photo album is 3 decimeters long, 1.8 decimeters wide, and 3 centimeters thick. To pack the two photo albums together, at least how much square decimeters of wrapping paper is needed. (not counting joints)
小明今天生日，同学们送他2本影集，每本影集的长3分米，宽1.8分米，厚3厘米，将两本影集包装在一起，至少要多少平方分米的包装纸．(接头处不计)
<gadget id="calculator">3 * 1.8</gadget>
<output>5.4</output>

<gadget id="calculator">3 + 3</gadget>
<output>6</output>

<gadget id="calculator">6 / 10</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">3 * (3/5)</gadget>
<output>9/5 = around 1.8</output>

<gadget id="calculator">1.8 * (3/5)</gadget>
<output>1.08</output>

<gadget id="calculator">5.4 + (9/5) + 1.08</gadget>
<output>8.28</output>

<gadget id="calculator">8.28 * 2</gadget>
<output>16.56</output>

<result>16.56</result>