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设函数f(x)=|x+1|+|x-a|的图象关于直线x=1对称,则a的值为( )...
设函数f(x)=|x+1|+|x-a|的图象关于直线x=1对称,则a的值为( )
A.3
B.2
C.1
D.-1
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