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设f(x)是定义在R上的偶函数,且f(1+x)= f(1-x),当-1≤x≤0时,f (x) = - x,则f (8.6 ) = _________
人气:196 ℃ 时间:2019-08-19 19:58:18
解答
∵f(x)是定义在R上的偶函数∴x = 0是y = f(x)对称轴;
又∵f(1+x)= f(1-x) ∴x = 1也是y = f (x) 对称轴.故y = f(x)是以2为周期的周期函数,∴f (8.6 ) = f (8+0.6 ) = f (0.6 ) = f (-0.6 ) = 0.3
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