In the ratio, the two outer terms are the reciprocals of each other, one of the inner terms is 2.2, and the other inner term is 2.2.
在比例中，两个外项互为倒数，其中一个内项是2.2，另一个内项是多少．
<gadget id="calculator">1 / 2.2</gadget>
<output>0.454545</output>

<result>0.454545</result>