引用樓主sze4562003於2009-09-19 12:37發表的 HELP...''數學 :
有題唔識- -''
(5-3i/4+3i) = (x+y)+(3x-y)i
.......
L.H.S.
(5-3i)
=-----------
(4+3i)
(5-3i)x
(4-3i) =---------------- Consider:
(4+3i)x
(4-3i) 20-9-27i
=------------
25
11 27
=--- - ----- i
25 25
Comparing real and imaginary parts of both sides
x+y=11/25
3x-y=-27/25
solving equations
x=-4/25
y=3/5
P.S. 部份科學計算機根本便有計算complex number的功能(例: fx-3650P),而我也檢查了答案無誤了
[ athrun在2009-09-19 13:40重新編輯此帖 ]