If the radius of the base of the cylinder is increased by 5 times and the height is decreased by 5 times, what is the change in the volume of the cylinder?
圆柱的底面半径扩大5倍，高缩小5倍，圆柱体积变化是多少．
<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">25 / 5</gadget>
<output>5</output>

<result>5</result>