A cylinder has a base area of 314 square decimeters and a surface area of 1256 cubic decimeters, what is its volume?
一个圆柱的底面积是314平方分米，表面积是1256立方分米，它的体积是多少？
<gadget id="calculator">314 * 2</gadget>
<output>628</output>

<gadget id="calculator">1_256 - 628</gadget>
<output>628</output>

<gadget id="calculator">2 * 3.14 * 10</gadget>
<output>62.8</output>

<gadget id="calculator">628 / 62.8</gadget>
<output>10</output>

<gadget id="calculator">314 * 10</gadget>
<output>3_140</output>

<result>3_140</result>