f(x)=e^x﹢2x²﹣3x不是 双曲线Yes!它是函数。能帮忙解答这个题目吗?1. f ‘(x)=e^x+4x-3 , 斜率 f’(1)=e+1切线y-(e-1)=(e+1)(x-1) 即 y = (e+1)x -22. e^x+2x^2 -3x ≥ 5x²／2+(a-3)x+1 令 g(x)= e^x+2x^2 -3x - { 5x²／2+(a-3)x+1 } , g’(x)= e^x - x – a , g”(x)=e^x – 1 ≥0即 当x≥1/2 时，g(x)= e^x - x²／2 – ax -1≥0g(1/2)= √e -9/8-a/2 ≥0 =>a≤2√e - 9/4①g’(1/2) = √e - 1/2 – a ≥0=> a≤√e – 1/2②由①、②得：a≤√e – 1/2