利用行列式解方程组

二元一次方程组： (1) { a 11 x 1 + a 12 x 2 = b 1 a 21 x 1 + a 22 x 2 = b 2 \left\{ \begin{array}{l} a_{11}x_1+a_{12}x_2=b_1\\ a_{21}x_1+a_{22}x_2=b_2 \end{array}\right. \tag{1} {a11​x1​+a12​x2​=b1​a21​x1​+a22

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