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下列哪些是线性映射()

A.[a1,a2,...,an-1,an]→[a2,a3,...,an,a1]

B.[a1,a2,...,an-1,an]→[a1,a1,a2,...,an]

C.[a1,a2,...,an-1,an]→[a1,a2,...,an]

D.[a1,a2,...,an-1,an]→[a1²,a2²,...,an²]

参考答案