In a ratio, two internal terms are known to be reciprocals of each other, one of the external terms is the largest composite number within 10, what is the other external term
在一个比例中，已知两个内项互为倒数，其中一个外项是10以内最大的合数，另一个外项是多少
<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">(1/9) / 9</gadget>
<output>1/81 = around 0.012346</output>

<gadget id="calculator">9 * (1/81)</gadget>
<output>1/9 = around 0.111111</output>

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