... 2. VA - 2. q .1 = 2. 3 ,1 - 1, 2. 2 .1 = 4,4. MBC = -2 .VD = -2 .2, 2 = -4 ,4 QBA = VA - 2. q = 3,4 - 2 .1, 2 = 1; NBA = 0. QBC = 0; NBC = -VD = -2 ,2. Taỷi C: MCB = -2 .VD = -2 .2, 2 ... 466 2 4 2 (T)QH .28 d666 6(T)NH .28 e444 12 12 (T.m) M H .28 c C HOĩC KT CU 1 Page 62 ồMA = 0 ị ị -4 .VD + 2. q .1 + 2. P + 2. VB = 0. ị -4 .VD + 2 .1, 2 .1 + 2. 2 + 2 .1, 2 = 0. ... = 2, 922 .cos30o = 2, 530; NA = -VA.sina = -1 , 4 61. Taỷi B: MB = 2. VC - 4.P = 2. 4,4 61 - 4 .2 = 0, 922 . QBA = VA.cosa - 4.qtq.cosa = -2 ,13 2; QBC = P - VC = -2 ,4 61. NBA = -VA.sina...