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a=(1+√3j)/2
=1/2+j√3/2
=cos(60)+jsin(60)
a^20=[cos60+jsin(60)]^20
=cos(1200)+jsin(1200).....戴美弗定理
=cos(3*360+120)+jsin(3*360+120)
=cos120+jsin120
=-1/2+j√3/2
b=a-1
=cos(120)+jsin(120)
b^10=cos1200+jsin1200
c=a-j√3
=1/2-j√3/2
=cos(300)+jsin(300)
c^30=cos(9000)+jsin(9000)
=cos(25*360)+jsin(25*360)
=cos0+jsin0
=1
代入上式:
w=|a^20*b^10/5*c^30|
=|(-1/2+j√3/2)^2/(5*1)|
=|(1/4-3/4-j√3/2)/5|
=|-(1/2+j√3/2)/5|
=|(1+j√3)/10|
=√(1+3)/10
=2/10
=1/5
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