A cuboid block with a length of 42 cm, a width of 30 cm, and a height of 18 cm is dug on one side with a square groove of a cube with a depth of 10 cm. What is the surface area of this cuboid in square centimeters?
一个长42厘米，宽30厘米，高18厘米的长方体的木块，在一面挖一个深是10厘米的正方体方槽．那么这个长方体的外表面积是多少平方厘米？
<gadget id="calculator">42 * 30</gadget>
<output>1_260</output>

<gadget id="calculator">42 * 18</gadget>
<output>756</output>

<gadget id="calculator">30 * 18</gadget>
<output>540</output>

<gadget id="calculator">1_260 + 756 + 540</gadget>
<output>2_556</output>

<gadget id="calculator">2_556 * 2</gadget>
<output>5_112</output>

<gadget id="calculator">10 * 10 * 4</gadget>
<output>400</output>

<gadget id="calculator">5_112 - 400</gadget>
<output>4_712</output>

<result>4_712</result>