The construction team built a 2,600-meter-long embankment. Its cross-section is trapezoidal, with an upper base of 14 meters, a lower base of 16 meters, and a height of 0.8 meters. How many cubic meters of earth and stone do we need to dig?
施工队修筑一条长2600米的路基，它的横截面是梯形，上底14米，下底16米，高0.8米，一共需要挖土石多少立方米？
<gadget id="calculator">14 + 16</gadget>
<output>30</output>

<gadget id="calculator">0.8 / 2</gadget>
<output>0.4</output>

<gadget id="calculator">30 * 0.4 * 2_600</gadget>
<output>31_200</output>

<result>31_200</result>