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[单选题]
设A为m×n矩阵,B=(A,b),则方程组AX=b有无穷多解的充要条件是()
A.R(A)﹤R(B)
B.R(A)﹥R(B)
C.R(A)=R(B)=n
D.R(A)=R(B)﹤n
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A.R(A)﹤R(B)
B.R(A)﹥R(B)
C.R(A)=R(B)=n
D.R(A)=R(B)﹤n
A.A-kE~A-kE(k为任意常数)
B.Am~Λm(m为正整数)
C.若A可逆,则A-1~Λ-1
D.若A可逆,购A~E
A.n-m
B.m-n
C.m+n
D.-(m+n)
A.
B.
C.
D.