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已知:是同类项,则( )
A.m = 2,n = 1 B.m = 2,n = 5 C.m = – 2,n = – 1 D.m = 2,n = – 1
A.m = 2,n = 1 B.m= 2,n = 5 C.m= – 2,n = – 1 D.m= 2,n = – 1