khong thuc hien phep tinh hay cho biet chu so hang don vi cua moi ket qua sau
A, (2001+2002+2003+2004+..........+2007+2008+2009) - (21+32+43+54+......+98+119
)
B, (12+23+34+45+........+78+89+91) • 91•73•55•37•19
Chu y: ^•^ la nhan
Ai lam dung mk cho 2 tk viet ro CAU tra loi ko tom tat !!!
