The length of a cube glass tank is 2 decimeters. The water depth in this glass tank is 1.5 decimeters. If a stone is placed in it and the water level rises to 1.7 decimeters, what is the volume of the stone in cubic decimeters?
一个正方体玻璃缸棱长2分米，这个玻璃缸内水深1.5分米，若放入一石块完全浸没后，水面上升至1.7分米，石块体积是多少立方分米．
<gadget id="calculator">1.7 - 1.5</gadget>
<output>0.2</output>

<gadget id="calculator">2 * 2 * 0.2</gadget>
<output>0.8</output>

<result>0.8</result>