我觉得是外边12之11次方

而且折现应该是除而不是乘

Hello dushededidi,

I know what's your point.
Unfortunately, both of your options are not appropriate.

Take it easy,it's not your fault.
It is actually a practical issue.
Here is the concept,
you pay the PV at your latest prior transaction point + interest afterwards.
Meaning, practitioner won't use discount method to get the transaction price between two coupon dates.

For your convenience,
I built a model for you.

1. get PV at time 0= 1000/(1.1)
2. get interest = 1000 - PV
3. get monthly interest  = interest / 12
4. get your final price = PV + monthly interest X 11
    or
    FV - monthly interest

The solutions should match with each other as the model demonstrated.
I hope it helps.