The perimeter of a rectangle is 26 cm and its length is 8 cm. Width is long ((())/(())).
一个长方形的周长是26cm，其中长是8cm．宽是长的((())/(()))．
<gadget id="calculator">26 / 2</gadget>
<output>13</output>

<gadget id="calculator">13 - 8</gadget>
<output>5</output>

<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<result>5/8 = around 0.625</result>