以3i-的虚部为实部,以3i2+i的实部为虚部的复数是(    )A.3-3i     

以3i-的虚部为实部,以3i2+i的实部为虚部的复数是(    )

A.3-3i             B.3+i                C.-+i           D.+i

答案

解析:3i-的虚部为3,3i2+i的实部为-3,∴以3i-的虚部为实部,以3i2+i的实部为虚部的复数是3-3i.

答案:A

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