pair of glass fish tanks without a cover, the length is 5dm, the width and height are both 3dm, how much glass should be used to make the pair of fish tanks at least dm**2.
一对无盖的玻璃鱼缸，长5dm，宽和高都是3dm，做这对鱼缸至少用玻璃多少dm**2．
<gadget id="calculator">3 * 5 * 3</gadget>
<output>45</output>

<gadget id="calculator">3 * 3 * 2</gadget>
<output>18</output>

<gadget id="calculator">45 + 18</gadget>
<output>63</output>

<gadget id="calculator">63 * 2</gadget>
<output>126</output>

<result>126</result>