高考数学三轮复习冲刺模拟试题20复数一、选择题1.在复平面内,复数21ii对应的点的坐标为()A.、(-1,1)B.、(l,1)C.、(1,-l)D.、(-1,-l)2.i是虚数单位,复数31ii=()A.i21B.12iC.2iD.2i3.i是虚数单位,i33i=()A.i123-41B.i12341C.i6321D.i63-214.已知i2i1z,则复数z=()()A.-1+3iB.1-3iC.3+iD.3-i5.i是虚数单位,复数iiz37=()A.i2B.i2C.i2D.i26.复数10i12i()A.42iB.42iC.24iD.24i7.i是虚数单位,复数3+22-3ii等于()A.iB.-iC.12-13iD.12+13i8.复数ii)(43212的值是()A.-1B.1C.iD.ii9.试题)复数22()1ii(其中i为虚数单位)的虚部等于()A.iB.1C.1D.010.计算242(1)12iii()A.0B.2C.-4iD.4i11.复数2i2i()A.34i55B.34i55C.41i5D.31i512.复数iii111()A.iB.C.i1D.i1二、填空题13.设为虚数单位,则______.参考答案一、选择题1.A2.C3.B4.B5.B6.A7.【答案】A【解析】3+223ii(3+2)(23)13=23(23)13iiiiii(),选A.8.【答案】A【解析】22(12)144341343434iiiiiii,选A.9.【答案】B2222222()12(1)iiiiiii,所以虚部为1,选B.10.【答案】C解:242(42)(12)10(1)22412(12)(12)5iiiiiiiiiii,选C.11.【答案】A解:2(2)(2)34342(2)(2)555iiiiiiii,选A.12.【答案】D解:2211(1)1221(1)(1)12iiiiiiiiiiii,选D.二、填空题13.【答案】i【解析】因为44142430nnnniiii。所以26211iiiiii