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计算:(1)i(2-i)(3+i)(2)设复数z满足z+|z|=2+i,求z的值(3)(2+2i)2(4+5i)(5-4i)(1-i).
题目详情
计算:
(1)i(2-i)(3+i)
(2)设复数z满足z+|
|=2+i,求z的值
(3)
.
(1)i(2-i)(3+i)
(2)设复数z满足z+|
z |
(3)
(
| ||||
(5-4i)(1-i) |
▼优质解答
答案和解析
(1)i(2-i)(3+i)=(1+2i)(3+i)=1+7i;
(2)设z=a+bi(a,b∈R),由z+|
|=2+i,得
+a+bi=2+i,
∴
,解得
,则z=
+i;
(3)
=
=
=
=-2-2i.
(2)设z=a+bi(a,b∈R),由z+|
z |
a2+b2 |
∴
|
|
3 |
4 |
(3)
(
| ||||
(5-4i)(1-i) |
4i(4+5i) |
(5-4i)(1-i) |
-20+16i |
1-9i |
(-20+16i)(1+9i) |
(1-9i)(1+9i) |
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