Cut a cuboid whose length, width, and height are 7cm, 6cm, and 5cm respectively into two cuboids so that the sum of the surface areas of the two cuboids is the largest. What is the sum of the surface areas in cm**2?
把一个长、宽、高分别是7cm、6cm、5cm的长方体截成两个长方体，使这两个长方体的表面积之和最大，这时表面积之和是多少cm**2？
<gadget id="calculator">7 * 6</gadget>
<output>42</output>

<gadget id="calculator">7 * 5</gadget>
<output>35</output>

<gadget id="calculator">6 * 5</gadget>
<output>30</output>

<gadget id="calculator">42 + 35 + 30</gadget>
<output>107</output>

<gadget id="calculator">107 * 2</gadget>
<output>214</output>

<gadget id="calculator">7 * 6 * 2</gadget>
<output>84</output>

<gadget id="calculator">214 + 84</gadget>
<output>298</output>

<result>298</result>