2. Because f(x) is an even function, it decreases when it is less than 0 and increases when it is greater than 0. So we can

|2a^2+a+ 1|>； | 3a2-2a+1| a (a-3) (5a2-a+2) < 0, because 5a2-a+2 >; 0 is a constant, so a (a-3)