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1.5 克莱姆( Cramer )法则 PowerPoint PPT Presentation


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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 5 cramer

1.5 克莱姆(Cramer)法则


1 5 cramer

在把 个方程依次相加,得

证明


1 5 cramer

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


1 5 cramer

当 时,由于方程组 与方程组 等价,

也是方程组 的解.


1 5 cramer

例1求解方程组


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