Turn a piece of cylindrical steel bar weighing (2/3) kg into a conical part with the same base and height as it, what is the weight of the cut part in kg?
把一段重(2/3)千克的圆柱钢条车成一个和它等底等高的圆锥体零件，削去的部分重多少千克．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(2/3) * (2/3)</gadget>
<output>4/9 = around 0.444444</output>

<result>4/9 = around 0.444444</result>