3-meter-long bamboo pole is vertically inserted into a pool. The part of the bamboo pole that enters the mud is 0.5 meters, and the part that is exposed to the water is 0.6 meters. What is the depth of the pool in meters? What is the correct column
一根3米长的竹竿垂直插在水池中，竹竿的入泥部分是0.5米，露出水面的部分是0.6米．求池水深多少米？列式正确的是多少
<gadget id="calculator">3 - 0.5 - 0.6</gadget>
<output>1.9</output>

<result>1.9</result>