Code Coach Mathematics. Test case 4 and test case 5 keep failing (again)

Question

I am try to solve Code Coach Mathematics.

I have checked all equations and test my loops. But test case 4 and test case 5 keep failing.
Can someone give me a hint, what is tested in these cases.

Kevin ★ please help.

https://code.sololearn.com/c79d79D2CVpp/?ref=app

Answer 1

"An expression can include multiple operations"

Answer 2

I read the assignment after spending 30 minutes trying to find something wrong with your code, lol.
I forgot this challenge is one of the hardest.

Answer 3

Oo. I did not read that. Thank you.