classroom with a length of 8 meters, a width of 6 meters and a height of 3 meters is plastered around and on the top. After deducting the area of doors, windows and blackboards of 9.8 square meters, how many square meters is the plastered area?
长8米，宽6米，高3米的教室，在四周和顶部抹上石灰，扣除门、窗、黑板面积9.8平方米，抹石灰的面积有多少平方米？
<gadget id="calculator">8 * 6</gadget>
<output>48</output>

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

<gadget id="calculator">48 + 18</gadget>
<output>66</output>

<gadget id="calculator">66 * 2</gadget>
<output>132</output>

<gadget id="calculator">132 - 9.8</gadget>
<output>122.2</output>

<gadget id="calculator">48 + 122.2</gadget>
<output>170.2</output>

<result>170.2</result>