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[1 2]+[5 2] - [1 2]+[2 3] = [3 -1]
[3 4] [-1 0] [3 4] [0 1] [-1 0]
no 2)
[1 -1]+[1 1] = [2 0][2 0] = [4 0]
[2 -2] [4 -2] [6 -4][6 -4] [-12 16]
no 3)
[4 -8] inversnya = 1/-4 [ -3 8] = [ 3/4 -8/4] = [3/4 -2]
[1 -3] [-1 4] [ 1/4 -4/4] [1/4 -1]
no 4)
[ 2 3 4]2 3
[ 1 2 2]1 2
[ 2 1 3]2 1
det = (2.2.3) + (3.2.2) + (4.1.1) - (2.2.4) - (1.2.2) - (3.1.3)
= 12 + 12 + 4 - 16 - 4 - 9
= -1
no 5)
[0 2] A = [1 2]
[2 0] [ 3 4]
A = 1/-4 [0 -2][1 2]
[-2 0][3 4]
= -1/4 [ -6 -8]
[ -2 -4]
= [6/4 8/4]
[2/4 4/4]
= [3/2 2]
[1/2 1]
no 6)
[2 -3][x] = [12]
[5 4][y] [7 ]
[x] = 1/23 [ 4 3][12]
[y] [-5 2][ 7]
= 1/23 [69]
[-46]
= [3 ]
[-2]
2x + y = 2(3) + (-2)
= 6 - 2
= 4