If 9: x = y: a, and x and y are reciprocals of each other, then a = how much.
如果9：x=y：a，且x与y互为倒数，那么a=多少．
<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<result>1/9 = around 0.111111</result>