3ab²-[2a²b+(5ab²-3a²b)-a²]+b²
=3ab²-2a²b-(5ab²-3a²b)+a²+b²
=3ab²-2a²b-5ab²+3a²b+a²+b²
=-2ab²+a²b+a²+b²
=0.02+0.1+1+0.1
=1.22