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若f(z)＝2z＋－3i，f(＋i)＝6－3i，试求f(－z)．
若f(x)=2z+z-3i，f(z+i)=6-3i，则f(-z)=________
-3i,f(
+i)=6-3i,则f(-z)=__________.
-3i,f(
+i)=6-3i，试求f(-z).
－3i，f(
＋i)＝6－3i，试求f(－z)．
－3i，f(