A rectangular swimming pool is 50 meters long, 20 meters wide, 2 meters high and has an average depth of 1.5 meters. To paint its walls and ground, how many square meters is the painted area?
一个长方形的游泳池，从里面量长50米，宽20米，高2米，平均水深1.5米．粉刷它的四壁和地面，粉刷面积是多少平方米？
<gadget id="calculator">50 * 20</gadget>
<output>1_000</output>

<gadget id="calculator">50 * 2</gadget>
<output>100</output>

<gadget id="calculator">20 * 2</gadget>
<output>40</output>

<gadget id="calculator">1_000 + 100 + 40</gadget>
<output>1_140</output>

<gadget id="calculator">1_140 * 2</gadget>
<output>2_280</output>

<gadget id="calculator">2_280 - 1_000</gadget>
<output>1_280</output>

<result>1_280</result>