Exercise1. Write the following matrices into row echelon form.
(a) A=(1132?22100474)">A=???1132?22100474???A=(1132?22100474)
(c) C=(121457210121331578)">C=???121457210121331578???C=(121457210121331578)
(b) B=(234304131)">B=???234304131???B=(234304131)
(d) D=(11111?11?1?1?111?11??)">D=?? ? ??11111?11?1?1?111?11???? ? ??