T
thuy11b10_mk


cac ban giai ho to bai nay voi
Tim so hang tong quat cua day(Un)[khong du doan nhe!]
U1=11
U(n+1)=Un-9n+1
Tim so hang tong quat cua day(Un)[khong du doan nhe!]
U1=11
U(n+1)=Un-9n+1