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Estudos Gerais07/08/2024

1- Aplicando o método da ADIÇÃO, resolva os seguintes sistem...

1- Aplicando o método da ADIÇÃO, resolva os seguintes sistemas: a) {xy=5x+3y=9\left\{\begin{array}{l}x-y=5 \\ x+3 y=9\end{array}\right. b) {4xy=8x+y=7\left\{\begin{array}{l}4 x-y=8 \\ x+y=7\end{array}\right.

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