The symbol f represents an operation The symbol "F" represents an operation, and its operation results for some numbers are as follows: (1) f (1) = 0, f (2) = - 1, f (3) = 2, f (4) = - 3 ·; (2) f（1/2）=2,f（1/3）=3,f（1/4）=4,f（1/5）=5,···. According to the above rule, f (1 / 2013) + F (2014)

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• 20. 2.1 0.5 = 0.840.2 fill in the operation symbol