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设f(z)=1-,z1=2+3i,z2=5-i,则f等于
A.-4-4i
B.4+4i
C.4-4i
D.-4+4i
设f(z)=1-,z1=2+3i,z2=5-i,则f()=
-4-4i
4+4i
4-4i
-4+4i