There is a trapezoidal vegetable field with an upper base of 50 meters, a lower base of 60 meters, and a height of 30 meters. In the middle of this vegetable field is a parallelogram pool with a bottom of 3 meters and a height of 2 meters. This vegetable field actually grows vegetables. How big is the area?
有一块梯形的菜地，上底50米，下底60米，高30米，这块菜地中间有一个底是3米，高是2米的平行四边形的水池，这块菜地实际种菜的面积有多大？
<gadget id="calculator">50 + 60</gadget>
<output>110</output>

<gadget id="calculator">30 / 2</gadget>
<output>15</output>

<gadget id="calculator">110 * 15</gadget>
<output>1_650</output>

<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<gadget id="calculator">1_650 - 6</gadget>
<output>1_644</output>

<result>1_644</result>