how can I use this to fix, can you tell me the step, plz
thank you very very much
If the version of Bitcoin Core that you are running is older than version 10.0, then upgrade to version 10.0 or higher.
Then shut down Bitcoin Core.
Open a command line window in your operating system.
Run the bitcoin program from the command line adding -zapwallettxes as a command line option
The wallet will purge all three of these transactions, and will re-scan the blockchain to make sure that it isn't missing any confirmed transactions.
When the re-scan is complete, you will have access to the full balance again. Resend your 3 transactions, but make sure that you set a proper transaction fee this time so the transactions will confirm quickly. I always use a transaction fee of at least 0.0001 BTC per transaction, and higher if the transaction uses a lot of inputs or sends to a lot of outputs.