99999999999999999999999999999999999999999999999999999+1=100000000000000000000000000000000000000000000000000000
100000000000000000000000000000000000000000000000000000000000000000000
=\(1000000000000000000000000000000000000000000000000000000\)
cac ban tra loi dung rui nhung van de la lop 1 no chua co hoc so nay dau minh chi hoi bua thui