A cube with a side length of 9 cm is sawn into several cubes with a side length of 3 cm. How much does the surface area increase?
一个棱长9厘米的正方体木块，把它锯成若干块棱长是3厘米的正方体，表面积增加多少？
<gadget id="calculator">3 * 3 * 3</gadget>
<output>27</output>

<gadget id="calculator">9 / 27</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">9 * 9 * (1/3)</gadget>
<output>27</output>

<gadget id="calculator">3 * 3 * 6 * 27</gadget>
<output>1_458</output>

<gadget id="calculator">9 * 9 * 6</gadget>
<output>486</output>

<gadget id="calculator">1_458 - 486</gadget>
<output>972</output>

<result>972</result>