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复数(为虚数单位),若z是纯虚数,则实数a的值为( )
(A) -1 (B)0 (C)1 (D)2
复数的值是( )
A.-1 B.1 C.-32 D.32
复数z=i+i2+i3+i4的值是 ( )
A.-1 B.0 C.1 D.i
A.-1 B.1 C.32 D.-32
A.-32 B.1 C.-1 D.32