(a+3i)/(1+2i)=(a+3i)(1-2i)/(1-4i²)=(a-2ai+3i-6)/(1+4)=(a-6)/5+(3-2a)i/5;
因为是纯虚数;
所以a-6=0;
a=6;
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(a+3i)/(1+2i)=(a+3i)(1-2i)/(1-4i²)=(a-2ai+3i-6)/(1+4)=(a-6)/5+(3-2a)i/5;
因为是纯虚数;
所以a-6=0;
a=6;
很高兴为您解答,skyhunter002为您答疑解惑
如果本题有什么不明白可以追问,