... P1. (-0 ,2) + P 2 .0,6 + P3.0 ,2 = = 2. (-0 ,2) + 3.0,6 + 2. 0 ,2 = 1,8(T.m) phkQ = P1. (-0 ,2) + P 2 . (-0 ,4) + P3.0 ,2 = = 2. (-0 ,2) + 3. (-0 ,4) + 2. 0 ,2 = -1 ,2( T.m) * Nháûn xẹt: Kãút qu ca hai ... FGdsQFEdsNJEdsM.. 2 .... 2 ... 2 . 22 2u++ Suy ra dA* = -dT = - ÷÷øưççèỉ++FGdsQFEdsNJEdsM 2 .. 2 . 2 . 22 2u A* = òåòåòåòúûùêëé+ +-= FGdsQFEdsNJEdsMdA 2 .. ... - Cạc â.a.h.Mk & â.a.h.Qk âỉåüc v trãn hçnh v. - Xạc âënh Mk Mk = q.v = ++ - ) 2 4.1.() 2 2.1.( qq ) 2 2.1.( - + q = 0 - Xạc âënh Qk: Qk = + - + ) 2 2.5,0.() 2 2.5,0.(...