2019高考数学二轮复习大题专项练习(八)不等式选讲(无答案)理.doc

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1大题专项练习(八) 不等式选讲12018江西抚州临川最后一模已知函数 f(x)| x a| x1|.(1)若 a2,求函数 f(x)的最小值;(2)如果关于 x 的不等式 f(x)4| a1|,求实数 a 的取值范围;(2)若存在实数 x, y,使 f(x) g(y)0,求实数 a 的取值范围52018青海西宁二模已知函数 f(x)| x1| x4|.(1)若 f(x) m26 m 恒成立,求实数 m 的取值范围;(2)在(1)的条件下,设 m 的最大值为 M0, a, b, c 均为正实数,当 3a4 b5 c M0时,求 a2 b2 c2的最小值462018江西师大附中三模已知函数 f(x) ,其中 a, b 为正实数|x4a| |x 1b|(1)若 a b1,求不等式 f(x)6 的解集;(2)若 f(x)的最小值为 1,问是否存在正实数 a, b,使得不等式 a4 b16 能成立?若存在,求出 a, b 的值,若不存在,请说明理由

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