rectangular hall with a circumference of 100 meters, and the length is 1 meter less than twice the width, what is the area of the rectangular hall in square meters?
一个周长是100米的长方形大厅，长比宽的2倍少1米，这个长方形大厅的面积是多少平方米？
<gadget id="calculator">2 + 100</gadget>
<output>102</output>

<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">4 + 2</gadget>
<output>6</output>

<gadget id="calculator">102 / 6</gadget>
<output>17</output>

<gadget id="calculator">17 * 2</gadget>
<output>34</output>

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

<gadget id="calculator">33 * 17</gadget>
<output>561</output>

<result>561</result>