After cutting a 4-meter-long cuboid into three sections, the surface area increases by 42.8 square centimeters. What is the volume of this log in cubic meters?
把一根长4米的长方体木料截成三段后，表面积增加42.8平方厘米．这根木料的体积是多少立方米？
<gadget id="calculator">42.8 / 10_000 / 4</gadget>
<output>0.00107</output>

<gadget id="calculator">0.00107 * 4</gadget>
<output>0.00428</output>

<result>0.00428</result>