Here comes the math problem!

This seems to be a complicated mathematical problem, but it is actually a mystery. Challenge your math mind and see who can solve this problem first!

Original formula calculation

The original formula = 900× 9+(18+28+38 ...+98) = 8100+8× 9+(10+20+...+90) = 81.

A seemingly complicated formula

This math problem looks complicated, but in fact it has a simple solution. As long as you master the mystery, you can solve it easily.

Challenge your math mind.

This math problem needs your brain and math mind. Come and challenge and see if you can be the first person to solve this problem!

Interesting math

Mathematics is not a boring subject, but it can also be interesting. This math problem is a good example, which makes you feel the fun of math in the process of solving puzzles.

Formula decryption

This math problem is like a password that needs to be decrypted. Only when you master the law can you unlock its secrets. Let's decrypt this formula together!