A 4.5-meter-long bamboo pole is inserted into the water. The water depth is 3.6 meters. The part of the bamboo pole that enters the mud is 0.4 meters. How many meters is the part above the water?
把一根4.5米长的竹竿插入水中，水深3.6米，竹竿入泥部分是0.4米，露出水面的部分是多少米？
<gadget id="calculator">4.5 - 3.6 - 0.4</gadget>
<output>0.5</output>

<result>0.5</result>