What is the area of a square swimming pool with a perimeter of 400 meters?
一个周长是400米的正方形游泳池，它的面积是多少公顷．
<gadget id="calculator">400 / 4</gadget>
<output>100</output>

<gadget id="calculator">400 / 4 / 10_000</gadget>
<output>1/100 = around 0.01</output>

<gadget id="calculator">100 * (1/100)</gadget>
<output>1</output>

<result>1</result>