例8-2 220∠35°+(17+j9)(4+j6) 20+j5 19.24∠27.9°×7.211∠56.3° =180.2+i126.2+ 20.62∠14.04 =180.2+j126.2+6.728∠70.16 In[11):=N[ArcTan[9/17]*180/Pi] 0ut11户27,8973 In[13):=N[ArcTan[6/4]*180/Pi] =180.2+j126.2+2.28+j6.33 0ut1356.3099 ln14=[ArcTan[5/20]*180/pi] =182.48+j132.53 0ut14=14.03621 1n1j=0ut[11]+0ut[13]-0ut[14] =225.5∠36 0utf1570,171 1n1o1:=N[ArcTan[132.53/182.48]+180/Pi] 0ut16时35.9898例8-2 20 j5 (17 j9) (4 j6) 220 35          20.62 14.04 19.24 27.9 7.211 56.3 180.2 j126.2         180.2 j126.26.72870.16 180.2  j126.2  2.28  j6.33 182.48  j132.53   225.536