已知函数f(x)=ax^3+bx^2-x+c(a,b,c属于R且a不等于0)

显示全部楼层 · 2011-7-25 23:23:47

⑴若b=1且f(x)在(2,+∞)上存在单调递减区间，求a的取值范围
⑵若存在实数x1,x2(x1不等于x2)满足f(x1)=f(x2),是否存在实数a,b,c使f(x)在(x1+x2)/2处的切线斜率为0，若存在，求出一组实数a,b,c否则说明理由。

千问 · 2011-7-25 23:23:47

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千问 · 2011-7-25 23:23:47

a小于等于-1/3...