B1)QHTT bang pp don hinh voi co so xuat phat B=(a1,a2,a3) Bien doi ve dang ma tran don vi sau do lap bang don hinh voi Cj lan luot la he so cua a1,2,... chon delta K la so duong lon 1, hj=Xj / cot xoay ( lay so duong nho nhat). ket thuc khi delta K am.

B2) pp don hinh 2 pha: jaj bt phu bang cach lap bang don hjnh them a4,5,6 he so la 0,1( 1 voi a4,5,6). ket thuc khj delta K am (V4,5,6k =0 k=1,3) => bo qua duoc A4,5,6.Jaj bt goc: voi co so tim duoc o tren (lay he so cua x1,2,..).

B3)PP don hinh: neu la bpt them vao a5,6,7 va lap bang don hjnh voj Cj la' he so cua x1,2,.. va 0 voi a5,6,7. lam den khj K am.

B4) ham phat: them vao Mx5,... vao' F(x)=> viet: Fm(x)=... +mx5+mx6+mx7. he pt thj cong them x5 or x6... Lap bang don hjnh voi delta K va'hang' M( lay theo ja trj duong lon 1 cua M) lam den khj M am het.Chu y: Do a5 o a6 o a7 la bien co so nen co the bo qua