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a.AB=
1 1. x 1 -1. = 1(1)+-1(1) 1(-1)+1(-2)
1 -2. 1 -2. 1(1)+-2(1) 1(-1)+-2(2)
=1-1 -1-2. =2 -3
1-2. -1-4. -2 -5
b.A invers
1/1 (1 -1) (1 -2)
1 (0+2)
1+2=3
A invers=1/3
maaf jika salah