After a part of length 8cm is cut off from a cuboid, the surface area is reduced by 64cm**2, and the remaining part is exactly a cube. Find the volume of the original cuboid.
一个长方体截去长8cm的一部分后，表面积减少64cm**2，这时剩下的部分正好是一个正方体，求原长方体的体积．
<gadget id="calculator">64 / 4 / 8</gadget>
<output>2</output>

<gadget id="calculator">2 + 8</gadget>
<output>10</output>

<gadget id="calculator">10 * 2 * 2</gadget>
<output>40</output>

<result>40</result>