Three cylinders with a length of 6 cm and equal base areas are put together to form a large cylinder, and the surface area is reduced by 18.84 cubic centimeters. What is the volume of the assembled large cylinder in cubic centimeters?
把3个长6厘米，底面积相等的圆柱体拼成一个大圆柱，表面积减少了18.84立方厘米，拼成的大圆柱的体积是多少立方厘米？
<gadget id="calculator">18.84 / 4</gadget>
<output>4.71</output>

<gadget id="calculator">6 * 3</gadget>
<output>18</output>

<gadget id="calculator">4.71 * 18</gadget>
<output>84.78</output>

<result>84.78</result>