问题
解答题
(1)已知z1=5+10i,z2=3-4i,
(2)已知(1+2i)
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答案
(1)∵
=1 z1
=1 5+10i
=5-10i (5+10i)(5-10i)
,1-2i 25
=1 z2
=1 3-4i 3+4i 25
∴
+1 z1
=1 z2
,4+2i 25
故z=
=25 4+2i
=5-25(4-2i) 20
i.5 2
(2)∵
=. z
=4+3i 1+2i
=2-i,10-5i 5
∴z=2+i,
=z . z
=2+i 2-i
.3+4i 5