问题
解答题
已知z∈C,且|z|-i=
|
答案
设z=x+yi(x,y∈R),
代入得
-i=x-yi+2+3i,即x2+y2
=x+2x2+y2 -1=-y+3
解得
,故z=3+4i,x=3 y=4
∴
=z 2+i
=3+4i 2+i
=(3+4i)(2-i) (2+i)(2-i)
=2+i.10+5i 5
已知z∈C,且|z|-i=
|
设z=x+yi(x,y∈R),
代入得
-i=x-yi+2+3i,即x2+y2
=x+2x2+y2 -1=-y+3
解得
,故z=3+4i,x=3 y=4
∴
=z 2+i
=3+4i 2+i
=(3+4i)(2-i) (2+i)(2-i)
=2+i.10+5i 5