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由n个实数 组成的有序数组称 a a an , , , 1 2 \为n维向量，记作

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基变换与坐标变换 设向量空间的基①a1,,a,;基②1,…, 基变换:B,可由a1,…,a,唯一的线性表示,所以有 1=c1a1+c2a2+…+