1,-3,5,-7,9,-11,13.第N个数是多少?找规律的,请多多指教...

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1,-3,5,-7,9,-11,13.第N个数是多少?找规律的,请多多指教...1,-3,5,-7,9,-11,13.第N个数是多少?找规律的,请多多指教...1,-3,5,-7,9,-11,13.第

1,-3,5,-7,9,-11,13.第N个数是多少?找规律的,请多多指教...
1,-3,5,-7,9,-11,13.第N个数是多少?
找规律的,请多多指教...

1,-3,5,-7,9,-11,13.第N个数是多少?找规律的,请多多指教...
(2n-1)×（-1)^(n+1)