A piece of square steel is 6m long, and the cross section is a square with a side length of 2cm. If the steel of 1cm**3 weighs 7.8g, how much does the square steel weigh?
一块方钢长6m，横截面是一个边长为2cm的正方形，如果1cm**3的钢重7.8g，这块方钢重多少？
<gadget id="calculator">6 * 100</gadget>
<output>600</output>

<gadget id="calculator">2 * 2 * 600 * 7.8</gadget>
<output>18_720</output>

<result>18_720</result>