In a ratio, it is known that the product of two outer terms is 1, and one of the outer terms is the smallest prime number, then what is the other outer term.
在一个比例中，已知两个外项之积为1，其中一个外项是最小的质数，那么另一个外项是多少．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>