input (ai) bi), (ci), (di for i=2,3,., n do a1/d1→l d-le→d rlb:1→b end b /dn→ for i=n-1, n-2,-., 1 do ( bice1)/l1→x end output (xi) 点击此处绕束放映input (ai ),(bi ),(ci ),(di ) for i=2,3,…,n do ai-1／di-1 l di -lci-1  di bi -lbi-1 bi end bn／dn xn for i=n-1,n-2,…,1 do (bi -cixi+1 )／di xi end output (xi )