设x1,x2(x1<x2)是函数f(x)=x3+x2-(2b2+1)ax,(a>0)的两个极值点. (1)若x1=-2,x2=1,求a,b的值; (2)若x1≤x≤x2,且x2=a,不等式6f(x)+11a2≥0恒成立,求实数b的取值范围; (3)若x12+x22=6+4b2,且b>0,设an=,Tn为数列an的前n项和,求证:Tn<4. |
与“设x1,x2(x1<x2)是函数f(x)=a3x3+b2x2-(2b2+1)ax,(a>0)的两个极值点.(1)若x1=-2,x2=1,求a,b的值;(2)若x1≤x≤x2,且x2=a,不等式6f(x)+11a2≥0恒成立,求实数b的取值范围;”考查相似的试题有: