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2024届邯郸市高三第四次调研考试数学

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2024届邯郸市高三第四次调研考试数学试卷答案

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分析利用函数奇偶性和单调性之间的关系得到不等式f(x)>0和f(x)<0的解,然后将不等式(x-2)•f(x)<0转化为$\left\{\begin{array}{l}{x-2>0}\\{f(x)<0}\end{array}\right.$①或$\left\{\begin{array}{l}{x-2<0}\\{f(x)>0}\end{array}\right.$,②,进行求解.

解答解:∵f(x)是偶函数,且在[0,+∞)内是增函数,
∴f(x)在(-∞,0]内是减函数,
∵f(-3)=-f(3)=0,
∴f(3)=0.
则f(x)对应的图象如图:
则不等式(x-2)•f(x)<0等价为:
$\left\{\begin{array}{l}{x-2>0}\\{f(x)<0}\end{array}\right.$①或$\left\{\begin{array}{l}{x-2<0}\\{f(x)>0}\end{array}\right.$,②
由①得$\left\{\begin{array}{l}{x>2}\\{-3<x<3}\end{array}\right.$,得2<x<3.
由②得$\left\{\begin{array}{l}{x<2}\\{x>3或x<-3}\end{array}\right.$,得x<-3.
综上:2<x<3或x<-3.
故不等式的解集为:(-∞,-3)∪(2,3),
故选:A

点评本题主要考查函数奇偶性和单调性之间的关系的应用,利用数形结合是解决本题的关键.

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