A cylindrical steel is cut off by 1 meter, and the radius of its cross section is measured to be 10 cm. The cut volume accounts for (2/5) of this steel. What is the original volume of this steel in cubic decimeters?
一根圆柱形钢材，截下1米，量得它的横截面的半径是10厘米，截下的体积占这根钢材的(2/5)，这根钢材原来的体积是多少立方分米？
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 * (1/10)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/10) ** 2</gadget>
<output>1/100 = around 0.01</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">10 / (2/5)</gadget>
<output>25</output>

<gadget id="calculator">3.14 * (1/100) * 1 * 25</gadget>
<output>0.785</output>

<result>0.785</result>