2019高中数学第三章数系的扩充与复数3.2.3复数的除法课后训练新人教B版选修2_2.doc

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1、13.2.3 复数的除法课后训练1复数 ( )1 iiA1i B1iC1i Di2复数23i等于( )A34i B34iC34i D34i3已知复数 z1i,则21z等于( )A2i B2iC2 D24定义运算 abcd ad bc,则符合条件 1iz42i 的复数 z为( )A3i B13iC3i D13i5若 ii=2nn,则 n的值可能为( )A4 B5 C6 D76已知复数 z满足(12i) z43i,那么 z_.7若 x, yR,且 5=1i2i13xy,则 x_, y_.8已知复数 z23i, zi,则 12z等于_9已知 21()=fz,求 f(23i)与 f(1i)的值10设

2、zC,若| z|1,且 zi.(1)证明: 2必是实数;(2)求 1z对应的点的轨迹2参考答案1. 答案:B 1i 2iii 21i.2. 答案:A 3i 2i 86i 2i34i.3. 答案:B 21z 1z 1z. z1i,原式2i.故选B.4. 答案:A 由定义 iz ,所以 zi z42i.所以 z 42i13i.5. 答案:A i=, 1i,i n(i) n2,4,01,3kk N , n的值可能为 4.6. 答案:2i 由(12i) z43i,得 z 43i122i, z2i.7. 答案:1 5 51i2iixy, ii32ixy, i13x,( x y)( y2 x)i213i43i, 4,3解得 ,5.8. 答案:43i 12z23i 23i4i26i9i43 13i43i4i 243i.9. 答案:解: f(z)21, f(23i)23ii 69i1472i259,f(1i)21ii1 i+ i3i.10. 答案:分析:设 z a bi(a, b R),先将 21z进行化简再求解(1)证明:设 z a bi(a, b R),则 a2 b21( a0) 21 2i 2i1 2iab342ab R.(2)解:由(1),知 21z(a0) a2 b21,1 a0,或 0 a1, ,或 ,即 21z对应的点的轨迹是 x轴上除去 12, 这个区间内的所有点的两条射线

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