設(shè)A=,B=,且|A|=5,|B|=1,則|A+B|的值是:()
A.24 B.36 C.12 D.48
行列式的值是:()
A.0 B.1 C.2 D.3
A.(-2)n+1 B.(-1)n2n+1 C.-2n+1 D.-22