Find the law (1/(1+2)), (2/(2+3)), (3/(3+4)), (4/(4+5)), (5/(5+6) ),How many.
找规律(1/(1+2))、(2/(2+3))、(3/(3+4))、(4/(4+5))、(5/(5+6))、多少．
<gadget id="calculator">6 + 7</gadget>
<output>13</output>

<gadget id="calculator">6 / 13</gadget>
<output>6/13 = around 0.461538</output>

<result>6/13 = around 0.461538</result>