-1, (8/5), -(15/7), (8/3), -(35/11), (48/13)... What is the 10th number in this sequence.
-1，(8/5)，-(15/7)，(8/3)，-(35/11)，(48/13)…这个数列的第10个数是多少．
<gadget id="calculator">120 / 21</gadget>
<output>40/7 = around 5.714286</output>

<result>40/7 = around 5.714286</result>