Khi3 3.2.4 is one of the most complete scientific calculators you can find. It comes integrated with a multitude of functions of all types to solve all classes of mathematical problems.
It also comes equipped with its own declarations of algebraic problems, which also serve as a tutorial, giving you exercises and problems to solve (including some mini-games ina sudoku style). These problems are not only algrebraic but also for physics, chemistry, geometry, statistics, electricity and astronomy. In other words, everything you need to solve any scientific problem where mathematical calculations are necessary. It´s also highly entertaining.