The length and width of the rectangular parallelepiped exhaust pipe are both 6dm and the height is 5m. To make such an exhaust pipe with 5 sections, at least how many m**2 iron sheets are needed.
长方体的排风管，长和宽都是6dm，高5m，要制作5节这样的排风管至少需要多少m**2铁皮．
<gadget id="calculator">6 * 5</gadget>
<output>30</output>

<gadget id="calculator">30 * 2</gadget>
<output>60</output>

<gadget id="calculator">6 * 6</gadget>
<output>36</output>

<gadget id="calculator">36 * 2</gadget>
<output>72</output>

<gadget id="calculator">60 + 72</gadget>
<output>132</output>

<gadget id="calculator">132 * 5</gadget>
<output>660</output>

<result>660</result>