Pep
Right now, you can only do this on your phone. The ability to do this on your CPU/Play Login is a "Known issue"
The Google Play Website (play.google.com)
#6279670 Deleting apps from MY Apps/My Orders
Last updated on: February 2, 2013
https://support.google.com/googleplay/known-issues/1319135?hl=en
--'eh not sure, *might(?)* help to click that and "report issue". I did.
Guess it's a way to request it/thus an "Issue" to you, know?
Pep
To do this on your phone.
--Open Play Store via the Play Store App.
--Click "Apps" (to go into that vertical)
--Click Menu Button on your phone
Up will Pop up
My Apps
My Wishlist
Redeem
Settings
Help
--Choose My Apps
Screen will open with "Installed Apps". Beside that will be a Tab with "All Apps"
*********EDIT****** Apology, you *CAN* delete multiples. The first you find, press/hold until it changes color, down the list tap each one, there is an *X* top right of device. :

OOF:: GONE!
If it's no longer installed, will say "Free" and you'll see an "X" that you can delete it.
FYI-swipe delete does not work on Galaxy S3
Right swipe pulls you back to "installed" and left swipe does nothing :security:
----------ALSO NOTE: If you use Multiple Sign On to install Apps. When you go into Apps/All, you'[ll see your email address with a right side down arrow pull down.
Will have to do this with all accounts. :security: