A cuboid becomes a cube if its height increases by 2 centimeters, and its surface area increases by 56 square centimeters. What is the volume of the cuboid?
一个长方体，如果高增加2厘米就成了正方体，而且表面积要增加56平方厘米，原来这个长方体的体积是多少．
<gadget id="calculator">56 / 4</gadget>
<output>14</output>

<gadget id="calculator">14 / 2</gadget>
<output>7</output>

<gadget id="calculator">7 - 2</gadget>
<output>5</output>

<gadget id="calculator">7 * 7 * 5</gadget>
<output>245</output>

<result>245</result>