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[函数] 利用函数对称中心求范围

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isee posted 2021-7-24 22:30 |Read mode
已知函数`f(x)=\frac 2{3^x+1}-2x`,则不等式`f(x)+f(3-2x)>2`的解集为________.

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original poster isee posted 2021-7-24 22:33
计算知单调递减`f(x)`函数满足`f(-x)+f(x)=2`,于是不等式化为`f(x)+f(3-2x)>2=f(-x)+f(x)`,进步知`3-2x<-x`,故`x>3`.

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