已知二次函数f(x)=ax的平方+x,若X属于【0 1】时有f(x)的绝对值小于等于1恒成立,则实数af(x)=-x满足,对于任意的 属于【0,1】都有f()-f()的绝对值小于等于1恒成立,则a的取值范围

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