20 13 Zhejiang college entrance examination mathematics liberal arts examination questions 16 detailed explanation.
When x is equal to 1, we can get a+b=0, that is, b=-a, and substitute x 4-x 3+ax-a > in the intermediate formula; =0, that is, (x-1) (x 3+a) > = 0, and this formula can be decomposed into (x-1) 2 (x 2+x+1) > = 0 is constant, so a =-/kloc.