classroom is 12m long, 9m wide, and 3m high, and the roof and walls are painted (door and window area is 48.2m**2). How many square meters is the painted area?
一间教室长是12m，宽9m，高3m，粉刷屋顶和墙壁(门窗面积为48.2m**2)，刷的面积是多少平方米？
<gadget id="calculator">12 * 9</gadget>
<output>108</output>

<gadget id="calculator">12 * 3 * 2</gadget>
<output>72</output>

<gadget id="calculator">9 * 3 * 2</gadget>
<output>54</output>

<gadget id="calculator">54 - 48.2</gadget>
<output>5.8</output>

<gadget id="calculator">108 + 72 + 5.8</gadget>
<output>185.8</output>

<result>185.8</result>