直接《套公式》(克莱默法则)
x=|(b1,a12,a13)(b2,a22,a23)(b3,a32,a33)|/|(a11,a12,a13)(a21,a22,a23)(a31,a32,a33)|
y=|(a11,b1,a13)(a21,b2,a23)(a31,b3,a33)|/|(a11,a12.a13)(a21,a22,a23)(a31,a32,a33)|
z=|(a11,a12.b1)(a21,a22,b2)(a31,a32,b3)|/|(a11,a12,a13)(a21,a22,a23)(a31,a32,a33)|