Use a rectangular cardboard with a length of 50 cm and a width of 40 cm, and cut off a square with a side length of 2 cm from the four corners to make a carton. What is the volume of this carton? ．
用一张长50厘米，宽40厘米的长方形纸板，从四个角剪去边长2厘米的正方形后，做成纸盒，这个纸盒容积是多少？．
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">50 - 4</gadget>
<output>46</output>

<gadget id="calculator">40 - 4</gadget>
<output>36</output>

<gadget id="calculator">46 * 36 * 2</gadget>
<output>3_312</output>

<result>3_312</result>