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（通用版）2019版高考数学二轮复习第一部分第三层级难点自选专题四“函数与导数”压轴大题的抢分策略课件理（普通生）.ppt

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对于(或可化为)f(x1，x2)A的不等式，可选x1(或x2)为主元，构造函数f(x，x2)(或f(x1，x),主元法,对原不等式同解变形，如移项、通分、取对数；把不等式转化为左右两边是相同结构的式子的结构，根据“相同结构”构造辅助函数,构造“形似”函数,证明不等式f(x)g(x)(f(x)g(x)的问题转化为证明f(x)g(x)0(f(x)g(x)0)，进而构造辅助函数h(x)f(x)g(x)(如本例),移项法,谢谢观看,

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