(1/1+I)+(A/1-I)为纯虚数,求A?

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(1/1+I)+(A/1-I)为纯虚数,求A?
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(1/1+I)+(A/1-I)为纯虚数,求A?
(1/1+I)+(A/1-I)为纯虚数,求A?

(1/1+I)+(A/1-I)为纯虚数,求A?
1/(1+I)=(1-i)/2
A/(1-i)=(1+i)*A/2
因为2式相加为纯虚数,所以(1/2)+A/2=0
所以A=-1

A=-1
纯虚数是指实部为0 虚部含I
如2I 3I...