Cut off the largest cube from a cuboid with a length of 8 cm, a width of 7 cm, and a height of 6 cm. What is the surface area of the remaining geometrical body in square centimeters?
从一个长为8厘米，宽为7厘米，高为6厘米的长方体中截下一个最大的正方体，剩下的几何体的表面积是多少平方厘米．
<gadget id="calculator">8 * 7</gadget>
<output>56</output>

<gadget id="calculator">8 * 6</gadget>
<output>48</output>

<gadget id="calculator">7 * 6</gadget>
<output>42</output>

<gadget id="calculator">56 + 48 + 42</gadget>
<output>146</output>

<gadget id="calculator">146 * 2</gadget>
<output>292</output>

<gadget id="calculator">6 * 6 * 2</gadget>
<output>72</output>

<gadget id="calculator">292 - 72</gadget>
<output>220</output>

<result>220</result>