Controversial addition, subtraction and division problem with six 9s

Recently, a math problem has been passed around on the internet. At first glance, it looks simple, but there is still debate about the answer.

The question is as follows: Use your intelligence to solve the following math problem: 9 - 9 : 9 + 9 - 9 : 9 = ?.

The problem is simple but controversial.

At first glance, many people will think this problem is extremely simple, but when calculating the answer, it is not accurate. Remember the rules of multiplication, division, addition, and subtraction to be able to solve this problem successfully.

To solve this problem correctly, you must be a person with high IQ and excellent calculation ability. Scroll down to the comment section and leave your answer.

Source: https://vtcnews.vn/bai-toan-cong-tru-chia-sau-so-9-gay-tranh-cai-ar885884.html