1设复数z满足i,则|z|()A1 BC. D2答案A解析由题意知1zizi,所以zi,所以|z|1.2若a为实数,且(2ai)(a2i)4i,则a()A1 B0C1 D2答案B解析由于(2ai)(a2i)4a(a24)i4i,所以,解得a0.故选B.3.若复数z满足i,其中i为虚数单位,则z()A1i B1iC1i D1i答案A解析由已知i(1i)ii2i1,所以z1i.故选A.4.设i是虚数单位,则复数i3()Ai B3iCi D3i答案C解析i3ii2ii,选C.5.已知1i(i为虚数单位),则复数z()A1i B1iC1i D1i答案D解析z1i.6.()A1i B1iC1i D1i答案D解析1i.故选D.7设i是虚数单位,表示复数z的共轭复数若z1i,则i()A2 B2iC2 D2i答案C解析原式i(1i)(ii2)i(1i)1ii12.8设复数abi(a,bR)的模为,则(abi)(abi)_.答案3解析复数abi(a,bR)的模为,则a2b23,则(abi)(abi)a2(bi)2a2b2i2a2b23.9若复数z12i,其中i是虚数单位,则_.答案6解析z12i,12i.z1516.10复数_.答案2i解析2i.