If you just need to update the Fusion Table, you might find it easier to access the table from your PC and use the FT controls there to delete rows etc.
Unfortunately, as indicated by Taifun, deleting multiple rows from the Table using Delete query from your Android device means you have to delete one row at a time.
Hopefully, this may be "the other way." Do return to this thread; someone might post an alternative solution we are not aware of.
Regards,
Steve