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若f(x)=2z+z-3i,f(z+i)=6-3i,则f(-z)=
题目详情
若 f ( x )= 2 z + z - 3 i , f ( z + i )= 6 - 3 i ,则 f (- z )= ________
▼优质解答
答案和解析
答案:
解析:
-6-4i
提示:
分析:
∵ f(z)=2z+-3i, ∴ f(+i)=2(+i)+(+i)-3i=2+i-2i ∵ f(+i)=6-3i,2+z-2i=6-3i ∴ z=2+i, ∴ f(-z)=-6-4i,
解析:
-6-4i
提示:
分析:
∵ f(z)=2z+-3i, ∴ f(+i)=2(+i)+(+i)-3i=2+i-2i ∵ f(+i)=6-3i,2+z-2i=6-3i ∴ z=2+i, ∴ f(-z)=-6-4i,
作业帮用户
2017-03-10
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