A trapezoidal vegetable field has an upper base of 60 meters, a lower base of 82 meters, and a height of 52 meters. If 9 kilograms of vegetables are collected per square meter, how many kilograms of vegetables are collected in these vegetable fields?
一块梯形菜地，上底是60米，下底是82米，高是52米．如果每平方米收青菜9千克，这些菜地收青菜多少千克？
<gadget id="calculator">60 + 82</gadget>
<output>142</output>

<gadget id="calculator">52 / 2</gadget>
<output>26</output>

<gadget id="calculator">142 * 26 * 9</gadget>
<output>33_228</output>

<result>33_228</result>