2019高中数学第三章数系的扩充与复数3.2.2复数的乘法课后训练新人教B版选修2_2.doc

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1、13.2.2 复数的乘法课后训练1若 x, yR,且(1i) x(1i) y2,则 xy 等于( )A1 B2 C2 D12已知 a, bR,则( a bi)(a bi)( a bi)( a bi)等于( )A( a2 b2)2 B( a2 b2)2C a2 b2 D a2 b23若复数 z11i, z23i,则 z1z2( )A42i B2iC22i D3i4i 是虚数单位,计算 ii 2i 3等于( )A1 B1 Ci Di512i3i 22 005i 2 004的值是( )A1 0001 000iB1 0021 002iC1 0031 002iD1 0051 000i6(1i) 2 00

2、8(1i) 2 008的值是_7已知( ai) 22i,则实数 a_.8复数 z a bi, a, bR,且 b0,若 z24 bz 是实数,则有序数对( a, b)可以是_(写出一个有序实数对即可)9设 z i(1i) 3(ai) 2,且 z 在复平面内对应的点与原点的距离为 12,则实数a_.10已知 z(1i) 3,求 .2参考答案1. 答案:A 由题意,( x y)( x y)i2, 2,0xy x y1, xy1.2. 答案:A ( a bi)(a bi) a2 b2,( a bi)( a bi)( a)2 b2 a2 b2,( a bi)(a bi)( a bi)( a bi)(

3、a2 b2)2.3. 答案:A z1z2(1i)(3i)3i3ii 232i142i.4. 答案:A ii 2i 3i1i1.5. 答案:C6. 答案:2 1 005 原式(1 i) 21 004(1i) 21 004(2i) 1 004(2i) 1 0042 1 004i1 0042 1 004i1 0042 1 0042 1 0042 1 005.7. 答案:1 由题意, a212 ai2i. 0,.a a1.8. 答案:(2,1) z24 bz( a bi)(a4 b bi) a24 ab abi abi4 b2i b2 a24 ab b2(2 ab4 b2)i 是实数,2 ab4 b20.2 b(a2 b)0. b0, a2 b. z 可以为(2,1)或(4,2)等9. 答案: 由题意,得| z|12,又| z| i(1i) 3(ai)2| i|1i| 3|ai| 2 2(1)=a.所以 a213,即 a 2.10. 答案:分析:若先求 z 再计算 z ,则运算较繁根据复数其与共轭复数的性质求解则比较简单解: z | z|2|(1i) 3|2|1i| 68.

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