A rectangular parallelepiped container with a bottom area of 2.5dm**2, first pour 2dm**3 of water into the container, then put a potato in and the water level rises to 1.1dm, what is the volume of the potato?
一个长方体容器，底面积是2.5dm**2，先向容器里倒入2dm**3的水，再放入一个土豆后水面升高到1.1dm，这个土豆的体积是多少？
<gadget id="calculator">2.5 * 1.1</gadget>
<output>2.75</output>

<gadget id="calculator">2.75 - 2</gadget>
<output>0.75</output>

<result>0.75</result>