and b are reciprocals of each other, ((a)/3)/(3/(b))=how much.
a和b互为倒数，((a)/3)/(3/(b))=多少．
<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

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