a=[01] b=[32] c=[53]
[12 ] [75] [32]
1)
a=[01] [12]
det a=-1 ≠ 0 (tem inversa)
(0....1)..(a....b)..(1......0)
(........)x(........)=(.........)
(1....2)..(c....d)..(0.......1)
0*a+1*c=1==>c=1
0*b+1*d=0 ==>d=0
1*a+2*c=0 ==>a=-2
1*b+2*d=1 ==>b=1
b)
det b=15-14 ≠ 0 (tem inversa)
(3....2)..(a....b)..(1......0)
(7....5)..(c....d)..(0.......1)
3*a+2*c=1==>c=-7
3*b+2*d=0 ==>d=3
7*a+5*c=0 ==>a=5
7*b+5*d=1 ==>b=-2
c)
det c=10-6 ≠ 0 (tem inversa)
(5....3)..(a....b)..(1......0)
(3....2)..(c....d)..(0.......1)
5*a+3*c=1==>c=--3
5*b+3*d=0 ==>d=5
3*a+2*c=0 ==>a=2
3*b+2*d=1 ==>b=-3
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Verified answer
1)
a=[01] [12]
det a=-1 ≠ 0 (tem inversa)
(0....1)..(a....b)..(1......0)
(........)x(........)=(.........)
(1....2)..(c....d)..(0.......1)
0*a+1*c=1==>c=1
0*b+1*d=0 ==>d=0
1*a+2*c=0 ==>a=-2
1*b+2*d=1 ==>b=1
b)
det b=15-14 ≠ 0 (tem inversa)
(3....2)..(a....b)..(1......0)
(........)x(........)=(.........)
(7....5)..(c....d)..(0.......1)
3*a+2*c=1==>c=-7
3*b+2*d=0 ==>d=3
7*a+5*c=0 ==>a=5
7*b+5*d=1 ==>b=-2
c)
det c=10-6 ≠ 0 (tem inversa)
(5....3)..(a....b)..(1......0)
(........)x(........)=(.........)
(3....2)..(c....d)..(0.......1)
5*a+3*c=1==>c=--3
5*b+3*d=0 ==>d=5
3*a+2*c=0 ==>a=2
3*b+2*d=1 ==>b=-3