函数y=f(x)与a-x=f(a-y)的图像关于直线x+y=a成轴对称.怎么证明?这条定理有什么应用吗?RT

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• 函数y=f(x)与a-x=f(a-y)的图像关于直线x+y=a成轴对称.怎么证明?这条定理有什么应用吗?
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