已知函数f(x)=ln(x+1)+ax若存在x∈[1,2],使不等式f'(x)≥2x成立,求a范围

已知函数f(x)=ln(x+1)+ax若存在x∈[1,2],使不等式f'(x)≥2x成立,求a范围
等差数列{An}的前n项和为Sn,已知A(m-1)+A(m+1)-A(m)²=0
S(2m-1)=38,(括号内的数位于下标)则m=()
设等比数列{An}的前n项和为Sn,若A1=1,S6=4*S3,则A4=()
设函数f(x)=3x^2+a/x^3(x∈(o,+∞))求正数a的取值范围,使对于任意x∈(0,+∞)都有f(x)>=20.
已知函数f(x)=(ax+1)×a的(-x)次幂,a>0且a≠1
(1) 讨论f(x)的单调性,并求出极值x0
(2)若(1)中的x0=g(a)在(1,e〕上的最小值
明月新 1年前 已收到2个回答 举报

鱼儿忆江南 幼苗

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1年前

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梦迁81 幼苗

共回答了34个问题 举报

最后一体的题目看的不是特明白,不太清楚你写的啥

1年前

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