Use an iron wire with a length of 18m to make a cuboid frame, so that the ratio of its length, width, and height is 4:3:2. Paste a layer of paper on the outside of the cuboid frame. How many square decimeters of paper are needed at least?
用一根长18m的铁丝作一个长方体框架，使它的长、宽、高的比是4：3：2，在这个长方体框架外面糊一层纸，至少需要多少平方分米的纸？
<gadget id="calculator">10 / 4</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">4 + 3 + 2</gadget>
<output>9</output>

<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">3 / 9</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">18 * (5/2) * (4/9) * 18 * (5/2) * (1/3)</gadget>
<output>300</output>

<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">18 * (5/2) * (4/9) * 18 * (5/2) * (2/9)</gadget>
<output>200</output>

<gadget id="calculator">18 * (5/2) * (1/3) * 18 * (5/2) * (2/9)</gadget>
<output>150</output>

<gadget id="calculator">300 + 200 + 150</gadget>
<output>650</output>

<gadget id="calculator">650 * 2</gadget>
<output>1_300</output>

<result>1_300</result>