Group the fractions arranged according to the law: (1/2), (3/4), (5/8), (7/16), (9/32)..., in this group of fractions, what is the eighth.
组按规律排列的分数：(1/2)，(3/4)，(5/8)，(7/16)，(9/32)…，这组分数中，第八个是多少．
<gadget id="calculator">32 * 2</gadget>
<output>64</output>

<gadget id="calculator">64 * 2</gadget>
<output>128</output>

<gadget id="calculator">128 * 2</gadget>
<output>256</output>

<gadget id="calculator">15 / 256</gadget>
<output>15/256 = around 0.058594</output>

<result>15/256 = around 0.058594</result>