∴ s=(3-2)*(-x？ +6x+ 10)-x=-x？ +5x+ 10 (one hundred thousand yuan) (x≥0)
(2)s=-x？ +5x+ 10=-(x-2.5)？ + 16.25
When the advertising fee100000 to 300000 yuan, that is, x∈ 1, 3.
According to the function image, when x ∈ 1, 2.5, the function s is monotonically increasing.
Therefore, when the advertising fee is 6,543,800+to 250,000, the company's annual profit will increase with the increase of advertising fee.
(3) When x=2.5, the maximum value of function S is smax= 16.25 (one hundred thousand yuan).
Therefore, when the advertising fee is 250,000 yuan, the company gets the highest annual profit of 6,543,800 yuan+0,625 yuan.