Pour 7.2 liters of water into a cup, the length of the cup is 3dm, the width is 2dm, and the height is 2dm. Then put a stone into the water, when the water depth is 1.5dm. What is the volume of the stone in dm**3.
在一个杯子倒入7.2升水，杯子长3dm，宽2dm，高2dm．再把一个石头放入水中，这时水深1.5dm．石头的体积是多少dm**3．
<gadget id="calculator">3 * 2 * 1.5</gadget>
<output>9</output>

<gadget id="calculator">9 - 7.2</gadget>
<output>1.8</output>

<result>1.8</result>