For a cube whose edge length is 5dm, if its edge length increases by 1dm, how much will its surface area increase by dm**2.
棱长是5dm的正方体，若它的棱长增加1dm，则表面积增加多少dm**2．
<gadget id="calculator">5 + 1</gadget>
<output>6</output>

<gadget id="calculator">6 ** 2</gadget>
<output>36</output>

<gadget id="calculator">6 * 36</gadget>
<output>216</output>

<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">6 * 25</gadget>
<output>150</output>

<gadget id="calculator">216 - 150</gadget>
<output>66</output>

<result>66</result>