设矩阵A,B,已知det(A)=2,det(B)=-7,求det(A+B)的值A=X1 B1X2 B2,B=y1 b1y2 b2,
问题描述:
设矩阵A,B,已知det(A)=2,det(B)=-7,求det(A+B)的值
A=
X1 B1
X2 B2,
B=
y1 b1
y2 b2,
答
设矩阵A,B,已知det(A)=2,det(B)=-7,求det(A+B)的值
A=
X1 B1
X2 B2,
B=
y1 b1
y2 b2,