141.4∠0 im(1)=3-y =14.26∠72.39 9.45 p(1)= R=305.02 2 m(1) K=3U=47.13∠0° i4713∠0° =10.83∠46.4° 3-315 p(3)= 2mR=175.9同理I=798∠322P3=95.52 (7) =6.41∠24.23 pn=56.55 I==4.94∠19.29p=36.60在时域中叠加 i=1426c0s(0t+7237)+10.83c0s{30t+46.4°) +7.98c0(50t+32.2l)+614c0s(70t+24.23”) p=P+p1+p2+…p=66980w305 02 21 1 14 26 72 39 3 9 45 2 1 0 p( ) I R . . . j . 141.4 0 Im(1) m( ) 0 = = =  −  = ( ) p p p p ...p 669.80w 7.98 cos(5 t .21 ) 6.14 cos(7 t .23 ) i 14.26cos( t 72.37) 10.83 cos(3 t .4 ) I . . p . I . . p . p( ) I R . I . . p . . . 3 - j3.15 47.13 0 K U 47.13 0 I 0 1 2 9 0 1 0 1 0 1 1 m(9) ( ) m(7) ( ) m( ) m(5) ( ) 0 m(3) 0 sm(3) = + + + = +  + +  + =  + +  + =  = =  = = = =  ==   = =  = 32 24 46 4 94 19 29 36 60 6 41 24 23 56 55 175 93 7 98 32 21 95 52 21 3 3 10 83 46 4 9 0 7 0 5 2 0 3 0 在时域中叠加 同 理 · · ··