Diagonals” method for 3×3 determinants. Row operations, Levi-Civita, permutations. Using the Casio 991ES. RREF. Video clips. | A minimum of blind calculation
CG143 Reducing an augmented matrix to reduced row echelon form - Casio Education - Australia
Echelon Form by Using Calculator/ Rank of Matrix by Casio fx-991ex & Casio fx-991es - YouTube
Basic Matrix Manipulation with a Casio Graphing Calculator
Casio FX-9750GII: How to find the Row Echelon Form (REF) and Row Reduced Echelon Form (RREF) - YouTube