Known: a series of regular numbers 1, (2/3), (5/8), (13/21), (34/55), (89/144), ..., then in this series of numbers, Counting from left to right, what is the 9th number?
已知：一串有规律的数1，(2/3)，(5/8)，(13/21)，(34/55)，(89/144)，…，那么在这串数中，从左往右数，第9个数是多少．
<gadget id="calculator">610 / 987</gadget>
<output>610/987 = around 0.618034</output>

<result>610/987 = around 0.618034</result>