Объяснение:
1.
[tex]\left|\begin{array}{ccc}5&9\\-3&7\\\end{array}\right|=5*7-(-3)*9=35-(-27)=35+27=62.[/tex]
2.
[tex]\left|\begin{array}{ccc}4&-3&6\\2&1&5\\7&-4&2\end{array}\right|=4*(1*2-(-4)*5)-(-3)*(2*2-7*5)+6*(2*(-4)-7*1)=\\=4*(2+20)+3*(4-35)+6*(-8-7)=4*22+3*(-31)+6*(-15)=\\=88-93-90=-95.[/tex]
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Answers & Comments
Объяснение:
1.
[tex]\left|\begin{array}{ccc}5&9\\-3&7\\\end{array}\right|=5*7-(-3)*9=35-(-27)=35+27=62.[/tex]
2.
[tex]\left|\begin{array}{ccc}4&-3&6\\2&1&5\\7&-4&2\end{array}\right|=4*(1*2-(-4)*5)-(-3)*(2*2-7*5)+6*(2*(-4)-7*1)=\\=4*(2+20)+3*(4-35)+6*(-8-7)=4*22+3*(-31)+6*(-15)=\\=88-93-90=-95.[/tex]