The two inner terms of the ratio are reciprocals of each other, one outer term is 9, and the other outer term is what
比例的两个内项互为倒数，一个外项是9，另一个外项是多少
<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

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