The sum of the sides of a rectangle is 180 cm, and the ratio of length, width, and height is 5:3:1. What is its volume in cubic centimeters?
一个长方形棱长的和是180厘米，长、宽、高的比是5：3：1．它的体积是多少立方厘米？
<gadget id="calculator">180 / 4</gadget>
<output>45</output>

<gadget id="calculator">5 + 3 + 1</gadget>
<output>9</output>

<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

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

<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">45 * (5/9) * 45 * (1/3) * 45 * (1/9)</gadget>
<output>1_875</output>

<result>1_875</result>