Naughty cut a cylindrical cucumber with a volume of 9 cubic centimeters into the largest cone, what is the volume cut off in cubic centimeters?
淘气把一个体积是9立方厘米的圆柱形黄瓜，削成一个最大的圆锥，削去的体积是多少立方厘米．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">9 * (2/3)</gadget>
<output>6</output>

<result>6</result>