Crame法则的简易证明

A Simple Proof of Crame’s Rule

用矩阵的运算和矩阵的行列式对Crame法则给出了一个简易的证明，避免使用通常教材中证明必须使用I,aplace展开定理、

Using the operation of matrix and the determinant of matrix, we have obtained a simple proof of Crame＇ s rule. This method aviodes the use of theorem of Laplace expansion.