If the length of a rectangle is increased by (1/10) to keep the area constant, how much should the width be reduced?
一个长方形，长增加(1/10)要使得面积不变，宽应该减少多少
<gadget id="calculator">11 / 10</gadget>
<output>11/10 = around 1.1</output>

<gadget id="calculator">1 / (11/10)</gadget>
<output>10/11 = around 0.909091</output>

<gadget id="calculator">1 - (10/11)</gadget>
<output>1/11 = around 0.090909</output>

<result>1/11 = around 0.090909</result>