TÍNH 1010 ÷ 101 + 4040 ÷ 101 − 6060 ÷ 606. 3 3

Bài 5. Tính

1010 ÷ 101 + 4040 ÷ 101 − 6060 ÷ 606.

3

Problem 6. How many digits can we replace @ with, so that the number 20@02019

is not greater than 20202020?