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1.5 克莱姆（ Cramer ）法则

1.5 克莱姆（ Cramer ）法则. 在把 个方程依次相加，得. 证明. 当 时 , 方程组 有唯一的一个解. 由代数余子式的性质可知 ,. 于是. 当 时 , 由于方程组 与方程组 等价 ,. 故. 也是方程组 的解. 例 1 求解方程组. 解.

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1.5 克莱姆（ Cramer ）法则

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  1. 1.5 克莱姆（Cramer）法则

  2. 在把 个方程依次相加，得 证明

  3. 当 时,方程组 有唯一的一个解 由代数余子式的性质可知, 于是

  4. 当 时,由于方程组 与方程组 等价, 故 也是方程组 的解.

  5. 例1求解方程组 解

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