Observe the following sequence of numbers, its arrangement is: 1, -(1/2), (2/3), -(3/4), (4/5), -(5/6),... , what is the 2009th number?
观察下面依次排列的一列数，它的排列规律为：1，-(1/2)，(2/3)，-(3/4)，(4/5)，-(5/6)，…，则第2009个数是多少．
<gadget id="calculator">2_009 - 1</gadget>
<output>2_008</output>

<gadget id="calculator">2_008 / 2_009</gadget>
<output>2_008/2_009 = around 0.999502</output>

<result>2_008/2_009 = around 0.999502</result>