SUMMARY when I want to delete an operation all are deleted. That only one operation be deleted SOFTWARE/OS VERSIONS Linux/KDE Plasma: (available in About System) KDE Plasma Version: KDE Frameworks Version: Qt Version: ADDITIONAL INFORMATION
Could be useful. Maybe it would make sense that you give Cantor (another KDE Edu application) a try and see if that's what you are looking for. It has a KAlgebra backend with about the same features.