kak... bantu ya kak.. matematika matriks INVERS PAKAI CARA YAA..

1. determinan A = 2.1 - -1.-1 = 2 - 1 = 1

invers A = 1 / 1 (1 1 bawahnya 1 2)
= ( 1 1 bawahnya 1 2)

2. determinan A = 4.2 - 7.1 = 8 - 7 = 1
invers A = 1 / 1 (2 -1 bawahnya -7 4)
= 2 -1 bawahnya -7 4)

determinan B = 2.4 - -7.-1 = 8 - 7 = 1
invera B = 1/1 ( 4 1 bawahnya 7 2)
-> saling invers