To save someone else a few seconds with a calculator, that's an average of just over 24 million per acquisition. Not that each was acquired for an equal amount.
The $1.9 Billion Google spent on acquistions excludes the Motorola deal. As the Motorola deal is expected to close sometime in 2012, so their $12.5 Billion acquistion would be included in the 2012 numbers - of course this is still up for regulatory approval.