A classroom is 8 meters long, 6 meters wide, and 4 meters high. The roof and four walls of the classroom are to be painted. Excluding the 25.4 square meters of doors, windows and blackboards, how many square meters is the painted area?
一间教室的长是8米，宽是6米，高是4米．要粉刷教室的屋顶和四面墙壁．除去门窗和黑板面积25.4平方米，粉刷的面积是多少平方米？
<gadget id="calculator">8 * 6</gadget>
<output>48</output>

<gadget id="calculator">8 * 4</gadget>
<output>32</output>

<gadget id="calculator">6 * 4</gadget>
<output>24</output>

<gadget id="calculator">32 + 24</gadget>
<output>56</output>

<gadget id="calculator">56 * 2</gadget>
<output>112</output>

<gadget id="calculator">112 - 25.4</gadget>
<output>86.6</output>

<gadget id="calculator">48 + 86.6</gadget>
<output>134.6</output>

<result>134.6</result>