定义域为a,b的函数y=fx图象上两点Aa,fa,Bb,fb,Mx,y是y=fx图象上任意一点，其中x=λa+1-λb,λ∈0,1.已知向量ON→=λOA→+1-λOB→，若不等式MN→≤k对任意λ∈_刷题宝

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定义域为a,b的函数y=fx图象上两点Aa,fa,Bb,fb,Mx,y是y=fx图象上任意一点，其中x=λa+1-λb,λ∈0,1.已知向量ON→=λOA→+1-λOB→，若不等式MN→≤k对任意λ∈0,1恒成立，则称函数fx在a,b上“k阶线性近似”．若函数y=x-

1

x

在1,3上“k阶线性近似”，则实数的k取值范围为( )

A： $0, + \infty)$

B： $\frac{1}{12}, + \infty)$

C： $\frac{4}{3} - \frac{2}{3} \sqrt{3}, + \infty)$

D： $\frac{4}{3} + \frac{2}{3} \sqrt{3}, + \infty)$

上一题下一题 0.0难度选择题更新时间:2019-02-26 10:47:43

答案(点此获取答案解析）

C

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