已知定义域为R的函数f(x)在(8,+∞)上为减函数,且函数y=f(x+8)为偶函数,则( )。A、f(6)>f(7) B、f(6)>f(9) C、f...

作者: tihaiku 人气: - 评论: 0
问题 已知定义域为R的函数f(x)在(8,+∞)上为减函数,且函数y=f(x+8)为偶函数,则( )。
选项 A、f(6)>f(7) B、f(6)>f(9) C、f(7)>f(9) D、f(7)>f(10)
答案 D
解析 上为减函数,故在(一m,8)上为增函数,检验知选D。

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