B1) pp don hinh doi ngau: lap ma tran don vi tim co so. sau khi tim duoc thi ( Cs gốc B=(a.a.a) la mtran dv ko la cs) lap bang don hinh de xem no co la cs ko (neu K duong thj no ko la cs va phaj them hang va cot a0 voi Xj= M va Cj=0 con' Cj cua a1.. la' he so; chu y: ko can cot hj va' phaj chon a0 lam hang xoay o bang dau tien; them a5,6,.. thj' Cj deu la 0) BT ket thuc khi Xj duong va' k am.

B2) Neu co cs xuat phat thj chj khac o cho ko duoc chon ngau nhjen cs B ma phaj chon theo db

B3) Neu la bpt thj' them cac ja trj x5,.. vao va chon Cj=0 va Xj la' ja trj sau dau = cua he pt. lap bang dh thj' chon ja trj cua Xj la so am nho nhat sau do tinh he so K/cot xoay (cot xoay chi tinh ja trj am ) chon ja trj duong nho nhat cua he so lam cot xoay. lam den khi Cj duong va K am.