非齊次線性方程組有解時(shí),a應(yīng)取下列何值()?
A.-2 B.-4 C.-6 D.-8
設(shè)行列式D1=,D2=,若D1=D2,則λ的取值為:()
A.2,-1 B.0,2 C.1,-1 D.0,1
矩陣的秩是:()
A.1 B.2 C.3 D.4