Respostas

2013-12-17T17:51:35-02:00
Utilize a regra de Sarrus

-2.2.(-2)+1.4.3+x.1.(-1)-3.2.x-1.1.(-2)-(-2).4.(-1)=-7\newline 8+12-x-6x+2-8=-7\newline -7x=-7-14\newline x= \frac{-21}{-7}=3


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