数学,第六题。
展开全部
(1)易得B^(-1)={(0.25,0.25),(-0.5,0.5)},B^(-1)表示B的逆
A=B^(-1)*B^(-1)={(-1/16,3/16)(-1/4,-1/8)}
(2)等式两边同乘矩阵B得
kI=4AB+B=4B^(-1)+B=4*{(0.25,0.25),(-0.5,0.5)}+{(2,-1),(2,1)}
={(0.5,0.5),(-1,1)}+{(2,-1),(2,1)}
={(2.5,-0.5),(1,2)}
= {(2.5,0),(0,2.2)}
易得k=2.5*2.2=5.5
A=B^(-1)*B^(-1)={(-1/16,3/16)(-1/4,-1/8)}
(2)等式两边同乘矩阵B得
kI=4AB+B=4B^(-1)+B=4*{(0.25,0.25),(-0.5,0.5)}+{(2,-1),(2,1)}
={(0.5,0.5),(-1,1)}+{(2,-1),(2,1)}
={(2.5,-0.5),(1,2)}
= {(2.5,0),(0,2.2)}
易得k=2.5*2.2=5.5
推荐律师服务:
若未解决您的问题,请您详细描述您的问题,通过百度律临进行免费专业咨询