若记a12-a2421=mta12\=D 2122 b1a2-a12b2 D 22 a1b2-b1a21= an b D 21 则当D≠0时该方程组的解为 D D 克莱姆法则 D D若记 1 12 1 22 12 2 2 22 1 , a b a a b D a b b − = = 11 11 2 1 21 2 21 1 2 , a a b b a D b a b − = = 11 12 11 22 12 21 21 22 , a a a a a a D a a − = = 则当 D  0 时该方程组的解为 1 2 1 2 , . D D x x D D = = 克莱姆法则