The value of determinant is equal to the value of a line multiplied by its corresponding algebraic cofactor B, so this problem can be transformed into algebraic cofactor and multiplied.

To convert a cofactor into an algebraic cofactor is to put a symbol in front of it.

The first one in the third line, (3+ 1=4, even, so add a+sign before it. )

The second in the third row, (3+2=5, odd number, preceded by a-sign. )

Wait, the answer is