CalcMatr
Calculations with matrixes of integers or fractions up to 4 x 5
...It allows submatrices extraction by selection of rows and columns.
Combined operations among matrixes: addition, subtraction, product, raising to a power
Systems of equations up to 4 equations with 4 unknowns, also introduced by the user or generated by the app: it makes the classification of the system and the resolution in consistent systems.