To make a drawer with a length of 30 cm, a width of 25 cm, and a depth of 10 cm, how many square centimeters of wooden boards should be used at least?
做一个长30厘米，宽25厘米，深10厘米的抽屉，至少用木板多少平方厘米？
<gadget id="calculator">30 * 25</gadget>
<output>750</output>

<gadget id="calculator">30 * 10</gadget>
<output>300</output>

<gadget id="calculator">25 * 10</gadget>
<output>250</output>

<gadget id="calculator">300 + 250</gadget>
<output>550</output>

<gadget id="calculator">550 * 2</gadget>
<output>1_100</output>

<gadget id="calculator">750 + 1_100</gadget>
<output>1_850</output>

<result>1_850</result>