The classroom is 8 meters long, 6 meters wide, and 3 meters high. To paint its walls and ceiling, deduct the area of doors and windows of 12.6 square meters. How many square meters should be painted?
教室长8米，宽6米，高3米，粉刷它的四壁和天花板，扣除门窗面积12.6平方米，需要粉刷的面积是多少平方米？
<gadget id="calculator">8 * 6</gadget>
<output>48</output>

<gadget id="calculator">8 * 3</gadget>
<output>24</output>

<gadget id="calculator">6 * 3</gadget>
<output>18</output>

<gadget id="calculator">24 + 18</gadget>
<output>42</output>

<gadget id="calculator">42 * 2</gadget>
<output>84</output>

<gadget id="calculator">84 - 12.6</gadget>
<output>71.4</output>

<gadget id="calculator">48 + 71.4</gadget>
<output>119.4</output>

<result>119.4</result>