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Senpai908

Сложим первую строку со вторым и вторую строку, умноженную на 3 с третьим, получим

...=begin{vmatrix}7&0&3&24\2&-1&4&10\14&0&10&52\1&0&1&0end{vmatrix}=-1cdot(-1)^{2+2}begin{vmatrix}7&3&24\14&10&52\1&1&0end{vmatrix}=\ \ \ =-(7cdot 10cdot 0+3cdot 52cdot 1+14cdot 1cdot 24-24cdot 10cdot 1-14cdot 3cdot 0-1cdot 52cdot 7)=\ \ =-(0+156+336-240-0-364)=112

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