A swimming pool is 50 meters long, 25 meters wide, and 1.8 meters deep. If tiles with a side length of 2 decimeters are pasted on the four walls and the bottom, how many tiles are needed in total?
一个游泳池长50米，宽25米，深1.8米，在四壁和底面贴上边长为2分米的瓷砖，共需要多少块瓷砖？
<gadget id="calculator">50 * 25</gadget>
<output>1_250</output>

<gadget id="calculator">25 * 1.8</gadget>
<output>45</output>

<gadget id="calculator">1.8 * 50</gadget>
<output>90</output>

<gadget id="calculator">1_250 + 45 + 90</gadget>
<output>1_385</output>

<gadget id="calculator">1_385 * 2</gadget>
<output>2_770</output>

<gadget id="calculator">2_770 - 1_250</gadget>
<output>1_520</output>

<gadget id="calculator">2 / 10</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/5) * (1/5)</gadget>
<output>1/25 = around 0.04</output>

<gadget id="calculator">1_520 / (1/25)</gadget>
<output>38_000</output>

<result>38_000</result>