Three cubes of iron with surface areas of 54dm**2, 96dm**2 and 150dm**2 are melted and cast into a large cube of iron. What is the surface area of this large cube?
将表面积分别是54dm**2、96dm**2、150dm**2的三个正方体铁块，熔铸成一个大的正方体铁块，这个大正方体的表面积是多少．
<gadget id="calculator">3 * 3 * 3</gadget>
<output>27</output>

<gadget id="calculator">4 * 4 * 4</gadget>
<output>64</output>

<gadget id="calculator">5 * 5 * 5</gadget>
<output>125</output>

<gadget id="calculator">27 + 64 + 125</gadget>
<output>216</output>

<result>216</result>