There is a laptop computer whose cover is 30 cm long and its width is 8 cm less than its length. What is its covering area in cm**2?
有一款笔记本电脑，它的盖面长30厘米，宽比长少8厘米．它的盖面面积是多少厘米**2？
<gadget id="calculator">30 - 8</gadget>
<output>22</output>

<gadget id="calculator">30 * 22</gadget>
<output>660</output>

<result>660</result>