... 11 0 12 038 0 11 0 038 0 11 0 3 00−∠−∠=⎟⎠⎞⎜⎝⎛ϕỴ 3 12 038 0 038 000−∠−∠=ϕ )A(,,j,jIB00 15 09 919 9707 31 33 0 32 9570 33 0 12 038 038 0 11 0−∠=−−=−−=−∠+−=ϕ−= )A(,j,j),j ,( *EIABA0000 30 9 910 9977 31 33 0 32 9570 33 086605 038 0760 33 0 12 038 0 038 0 038 03 11 0−∠=−=−=−−+=−∠+∠−∠=ϕ−= ... )A(,j,j),j ,( *EIABA0000 30 9 910 9977 31 33 0 32 9570 33 086605 038 0760 33 0 12 038 0 038 0 038 03 11 0−∠=−=−=−−+=−∠+∠−∠=ϕ−= )A(,,jj),j ,( *EIBCC0000909 919 91 33 0658 33 086605076 038 0 33 0 12 038 0 038 012 038 03 11 0∠===−−−−=−∠+∠−−∠−=ϕ−−= () () () )W(,*I*RP)W(,*I*RP)W(,*I*RPCCABBBAAA 39 69 911 00 39 69 911 00 39 69 911 00222222========= ... )A(,,j )( CjEICC6 6 13 1897682 31 1 012 020 1 00=∠=−−−∠=ωϕ−= )A(, )( )( RIN6 63 31 5 2 31 1 0−=−=−=ϕ= Bài 4.9: a) IA = IC = 9,5(A); IB = 4,92(A) W 1 = 18 05 (W)...