∵(a+2)^2恒≥0 ,|3b-1|恒≥0∴a=-2 ,b=1/33a^2b - [2ab^2 - 6(ab - 0.5a^2b) + 4ab] - 2ab=3a^2b - (2ab^2 - 6ab + 3a^2b + 4ab) - 2ab=3a^2b - 2ab^2 + 6ab - 3a^2b - 4ab - 2ab=-2ab^2=(-2)×(-2)×(1/3)^2=4/9...