rectangular playground is 99 meters long. A tree is planted equidistantly around the playground every 3 meters, and the vertices must be planted. A total of 100 trees are planted. What is the area of the rectangular playground?
一个长方形操场长99米，在操场的四周等距离地每隔3米种一棵树，且顶点必栽，一共栽了100棵，这个长方形的操场的面积是多少平方米？
<gadget id="calculator">99 / 3</gadget>
<output>33</output>

<gadget id="calculator">33 + 1</gadget>
<output>34</output>

<gadget id="calculator">34 * 2</gadget>
<output>68</output>

<gadget id="calculator">100 - 68</gadget>
<output>32</output>

<gadget id="calculator">32 / 2</gadget>
<output>16</output>

<gadget id="calculator">16 + 1</gadget>
<output>17</output>

<gadget id="calculator">17 * 3</gadget>
<output>51</output>

<gadget id="calculator">99 * 51</gadget>
<output>5_049</output>

<result>5_049</result>