Here I found the Sharp EL-W506, which offers all the functions required of me and was mostly rated good.
The calculator is clearly structured and intuitive. I am now come handle it.
In particular, changeable with one button representation of fractions like that.
After a few trials and the intensive use of the self-study, I am excited about the computer. He takes every keystroke on sovereign, which is very important especially for complex tasks.
This calculator can mE are recommended for those who need a scientific calculator for high school non-technical degree.