In a series of regular numbers, the missing number is: (1/2), (3/4), (9/8), how much, (81/32), ....
在一串有规律的数字中，缺的这个数是：(1/2)，(3/4)，(9/8)，多少，(81/32)，…．
<gadget id="calculator">9 * 3</gadget>
<output>27</output>

<gadget id="calculator">8 * 2</gadget>
<output>16</output>

<gadget id="calculator">27 / 16</gadget>
<output>27/16 = around 1.6875</output>

<result>27/16 = around 1.6875</result>