The 1.2-meter-long cylindrical steel is cut into three sections according to the ratio of 1:2:3, and the surface area is increased by 56 square centimeters compared with the original. Of the three sections of round steel, how much more cubic centimeters is the longest section than the shortest section?
把1.2米长的圆柱形钢材按1：2：3截成三段，表面积比原来增加56平方厘米．这三段圆钢中，最长一段比最短的一段多多少立方厘米？
<gadget id="calculator">56 / 4</gadget>
<output>14</output>

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

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

<gadget id="calculator">14 * 1.2 * (1/2) * 100</gadget>
<output>840</output>

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

<gadget id="calculator">14 * 1.2 * (1/6) * 100</gadget>
<output>280</output>

<gadget id="calculator">840 - 280</gadget>
<output>560</output>

<result>560</result>