i have try your way , but all i need is this address private key 1LqjM4jpuZSXp4Fx5jvJrAW8YC8sQjzMyZ
when i use
Blockchain.MyWallet.wallet._getPrivateKey(0-10,"M/0/48")
and import didn't find this address

why i can use this address receive and send bitcoin but i can not know this address private key?
blockchain.info wallet really bad
I think you want to use
Blockchain.MyWallet.wallet._getPrivateKey(0,"M/0/0"); instead of
Blockchain.MyWallet.wallet._getPrivateKey(0-10,"M/0/48")The address is in your first wallet, right? Changing the wallet number won't help, instead change the address number in that wallet.
Try
Blockchain.MyWallet.wallet._getPrivateKey(0-10,"M/0/48")Also, you just posted the private key of 2 of your addresses. Delete the image if you can, and please consider those comprimised. Don't use the 49th address in wallet 8 and 9, and to be safe, perhaps switch wallets if you haven't done so already.