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第一讲中的式子错误 #15

@JerryZhou343

Description

@JerryZhou343

方程组的矩阵型式不对。
例如:
线性方程组如下:

2x - y   = 0 
-x +2y   = 3 

矩阵型式:

[2    -1 ]   [ x ]      [0]
                       =
[-1   2  ]   [ y ]      [3]

但是文中却是:xy

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