There is a rectangular wheat field with a length of 48 meters and a width of 30 meters. In the middle of this wheat field there is a large triangular pit with a bottom of 12 meters and a height of 8 meters. How big is the area of this wheat field that can be cultivated?
有一块长方形的麦地，长48米，宽30米，在这块麦地的中间有一个三角形的大坑，底为12米，高为8米，这块麦地可以耕种的面积有多大？
<gadget id="calculator">48 * 30</gadget>
<output>1_440</output>

<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">12 * 4</gadget>
<output>48</output>

<gadget id="calculator">1_440 - 48</gadget>
<output>1_392</output>

<result>1_392</result>