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齐次方程组 Ax = 0 ， \det A = 5 != 0 。解？（答：平凡 \mathbf x = \mathbf 0 。）
齐次方程组 Ax = 0 ， \det A = 5 != 0 。解？（答：平凡 \mathbf x = \mathbf 0 。）
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