If the length of the rectangle is reduced to the original (1/10), and the width is also reduced to the original (1/10), then the area of the rectangle is reduced to the original.
长方形的长缩小为原来的(1/10)，宽也缩小为原来的(1/10)，那么长方形的面积缩小为原来的多少．
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/10) * (1/10)</gadget>
<output>1/100 = around 0.01</output>

<result>1/100 = around 0.01</result>