Answer:
is
non-singular, so A?1 exists.
A11 =
(?1)1+1(10 ? 0) = 10;
A12 =
(?1)1+2(0 + 0) = 0;
A13 =
(?1)1+3(0 ? 0) = 0;
A21 =
(?1)2+1(10 ? 0) = ?10;
A22 =
(?1)2+2(5 ? 0) = 5;
A23 =
(?1)2+3(0 + 0) = 0
A31 =
(?1)3+1(8 ? 6) = 2;
A32 =
(?1)3+2(4 ? 0) = ?4;
A33 =
(?1)3+3(2 ? 0) = 2
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