A cuboid, the ratio of the lengths of three adjacent sides is 3:2:1, the sum of the lengths of the sides is 18 cm, what is the volume in cubic centimeters
一个长方体，相邻三条边长度比3：2：1，棱长总和是18厘米，体积是多少立方厘米
<gadget id="calculator">18 / 4</gadget>
<output>9/2 = around 4.5</output>

<gadget id="calculator">3 + 2 + 1</gadget>
<output>6</output>

<gadget id="calculator">3 / 6</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">2 / 6</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(9/2) * (1/2) * (9/2) * (1/3) * (9/2) * (1/6)</gadget>
<output>81/32 = around 2.53125</output>

<result>81/32 = around 2.53125</result>