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                2016年成人高考高起點《數學(理)》難點(1)

                時間:2015-12-29 22:05:57作者:深圳智學學習網

                難點一:集合思想及應用

                集合是高中數學的基本知識,為歷年必考內容之一,主要考查對集合基本概念的認識和理解,以及作為工具,考查集合語言和集合思想的運用。本節主要是幫助考生運用集合的觀點,不斷加深對集合概念、集合語言、集合思想的理解與應用。

                1、難點磁場

                已知集合A={(xy)|x2+mx-y+2=0}B={(xy)|x-y+1=0,且0x2},如果AB≠ ,求實數m的取值范圍。

                難點二:充要條件的判定

                充分條件、必要條件和充要條件是重要的數學概念,主要用來區分命題的條件p和結論q之間的關系。本節主要是通過不同的知識點來剖析充分必要條件的意義,讓考生能準確判定給定的兩個命題的充要關系。

                2、難點磁場

                已知關于x的實系數二次方程x2+ax+b=0有兩個實數根α、β,證明:|α|<2|β|<22|a|<4+b|b|<4的充要條件

                難點三:運用向量法解題

                平面向量是新教材改革增加的內容之一,近幾年的全國使用新教材的高考試題逐漸加大了對這部分內容的考查力度,本節內容主要是幫助考生運用向量法來分析,解決一些相關問題。

                3、難點磁場

                三角形ABC中,A(5-1)B(-17)C(12),求:(1)BC邊上的中線AM的長;(2)CAB的平分線AD的長;(3)cosABC的值。

                (責任編輯:馬老師 )

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